| Common Name | Genus species | Blog Title | Blog Date |
|---|---|---|---|
| 14-spot ladybird beetle | Propylea quatuordecimpunctata | Ladybugs | Aug 6, 2021 |
| Adder’s tongue fern | Ophioglossum pusillum | Fern Fun | Jun 25, 2021 |
| Adonis blue butterfly | Lysandra bellargus | Butterfly Defense | Jul 29, 2022 |
| African elephant | Loxodonta atlantica | Beat The Heat | Aug 25, 2023 |
| Alderfly | Sialas sp. | Aquatic Insects | Feb 24, 2023 |
| Allen’s Hummingbird | Selasphorus sasin | Hummingbirds | Aug 23, 2024 |
| Aloe vera | Aloe vera | Succulents | Jul 15, 2022 |
| Amazon weasel | Neogale africana | Weasels | Mar 10, 2023 |
| Amelanchier | Amelanchier spp | Summer Berries | Jun 14, 2023 |
| American alligator | Alligator mississippiensis | Crocodilians, pt.1 | Apr 1, 2022 |
| American alligator | Alligator mississippiensis | Crocodilians, pt.2 | Apr 8, 2022 |
| American alligator | Alligator mississippiensis | Crocodilians, pt.3 | Apr 15, 2022 |
| American aster | Symphyotrichum spp | American asters | Oct 10, 2025 |
| American badger | Taxidea taxus | Oak Tree Habitat, pt.2 | Jul 12, 2024 |
| American beech tree | Fagus grandifola | Bark, pt.1 | Jan 21, 2022 |
| American beech tree | Fagus grandifola | Bark, pt.2 | Jan 28, 2022 |
| American black bear | Ursus americanus | Bearing Up In Winter | Nov 22, 2024 |
| American black bear | Ursus americanus | Bear Bones | Jan 10, 2025 |
| American coot | Fulica americana | Cattails | Jul 2, 2021 |
| American crocodile | Crocodylus acutus | Crocodilians, pt.1 | Apr 1, 2022 |
| American crocodile | Crocodylus acutus | Crocodilians, pt.3 | Apr 15, 2022 |
| American crocodile | Crocodylus acutus | Snake Defense | Dec 30, 2022 |
| American dog tick; Wood tick | Dermacentor variabilis | The Itch! | Aug 21, 2020 |
| American elm tree | Ulmus americana | Bark, pt.2 | Jan 28, 2022 |
| American goldfinch | Spinus tristis | Summer Pollinator Bloom | Aug 7, 2020 |
| American goldfinch | Spinus tristis | Backyard Birds | Oct 16, 2020 |
| American goldfinch | Spinus tristis | Backyard Birds | Feb 5, 2021 |
| American goldfinch | Spinus tristis | American Goldfinch | Jul 1, 2022 |
| American goldfinch | Spinus tristis | American asters | Oct 10, 2025 |
| American goldfinch | Spinus tristis | Happy Thanksgiving 2022 | Nov 25, 2022 |
| American greater flamingo | Phoenicopterus ruber | Flamingos | Feb 10, 2023 |
| American linden | Tilia americana | Tree Buds | Feb 25, 2022 |
| American oystercatcher | Haematopus americanus | Bird Beaks | Nov 24, 2023 |
| American painted lady | Vanessa virginiensis | Pollinator Garden | May 29, 2020 |
| American painted lady | Vanessa virginiensis | Summer Pollinator Bloom | Aug 7, 2020 |
| American painted lady | Vanessa virginiensis | American asters | Oct 10, 2025 |
| American robin | Turdus migratorius | Bird Nests | Mar 12, 2021 |
| American robin | Turdus migratoriu | Spring Migration | Feb 11, 2022 |
| American robin | Turdus migratoriu | Backyard Sounds | Jun 24, 2022 |
| American sycamore tree | Platanus occidentalis | Bark, pt.1 | Jan 21, 2022 |
| American sycamore seed | Platanus occidentalis | Seeds | Oct 1, 2021 |
| American toad | Anaxyrus americanus | American Toad | May 22, 2020 |
| American toad | Anaxyrus americanus | Midwestern Prairie | Nov 10, 2023 |
| American toad | Anaxyrus americanus | Sounds of Spring | May 9, 2025 |
| American toad | Anaxyrus americanus | Heat Effects | Jul 11, 2025 |
| American tree sparrow | Spizelloides arborea | Spring Migration | Feb 11, 2022 |
| American tree sparrow | Spizelloides arborea | American asters | Oct 10, 2025 |
| American white pelican | Pelecanus erythrorhynchos | Bird Song | Feb 28, 2025 |
| American woodcock | Scolopax minor | Spring Migration | Feb 11, 2022 |
| Amur honeysuckle | Lonicera mackii | Exotic Invasives | Apr 30, 2021 |
| Anglerfish | Melanocetidae spp | The Deep Ocean | Apr 14, 2023 |
| Anise hyssop | Agastache spp. | American asters | Oct 10, 2025 |
| Anna’s hummingbird | Calypte anna | Hummingbirds | Aug 23, 2024 |
| Antarctic krill | Euphausia superba | Baleen Whales | Oct 25, 2024 |
| Antelope jackrabbit | Lepus alleni | Desert Habitats, pt.3 | Nov 18, 2022 |
| Apollo swallowtail butterfly | Parnassius apollo | Pamir Wildlife | Mar 14, 2025 |
| Apple seed | Malus sp | Seeds | Oct 1, 2021 |
| Arctic fox | Vulpes lagopus | Arctic Adaptations | Dec 9, 2022 |
| Arctic fox | Vulpes lagopus | Boreal Forest in Winter | Jan 13, 2023 |
| Arrowhead | Sagittaria spp | Duck Potato Salad | Jan 20, 2023 |
| Aspen tree | Populus spp | Boreal Forest in Winter | Jan 13, 2023 |
| Atlantic puffin | Fratercula arctica | Puffins | Sep 22, 2023 |
| Atlantic puffin | Fratercula arctica | Bird Beaks | Nov 24, 2023 |
| Bald eagle | Haliaeetus leucocephalus | Urban Wild | Sep 18, 2020 |
| Bald eagle | Haliaeetus leucocephalus | Eagles | Jan 8, 2021 |
| Baltimore checkerspot | Euphydryas phaeton | Summer Pollinator Bloom | Aug 7, 2020 |
| Baltimore oriole | Icterus galbula | Neighborhood Nests | May 28, 2021 |
| Baltimore oriole | Icterus galbulla | Bird Song | Feb 28, 2025 |
| Bark scorpion | Centruroides exilicauda | Desert Habitats, pt.3 | Nov 18, 2022 |
| Barley | Hordeum sp | Happy Thanksgiving 2022 | Nov 25, 2022 |
| Barn Owl | Tyto alba | Illinois Owls p.1 | Dec 13, 2024 |
| Barn Owl | Tyto alba | Illinois Owls p.2 | Dec 27, 2024 |
| Barn Owl | Tyto alba | Great Horned Owl | Apr 11, 2025 |
| Barred Owl | Strix varia | Illinois Owls p.2 | Dec 27, 2024 |
| Basil Christian’s aloe | Aloe christianii | Herbaria | Oct 14, 2022 |
| Bay-breasted warbler | Setophaga castanea | Wood Warblers | Apr 22, 2022 |
| Beaver | Castor canadensis | Beavers | Jul 9, 2021 |
| Bee balm | Monarda sp | Hummingbirds | May 15, 2020 |
| Big sagebrush | Artimesia tridentata | Desert Habitats, pt.2 | Nov 11, 2022 |
| Big bluestem | Andropogon gerardii | Autumn Grass | Sep 17, 2021 |
| Big bluestem | Andropogon gerardii | Illinois State Symbols, pt.1 | Aug 26, 2022 |
| Big bluestem | Andropogon gerardii | Autumn Seed Collecting | Sep 9, 2022 |
| Big bluestem | Andropogon gerardii | Midwestern Prairie | Nov 10, 2023 |
| Big dipper firefly | Photinus pyralis | Fireflies | Jul 16, 2021 |
| Bighorn sheep | Ovis canadensis | Antlers & Horns | Aug 12, 2022 |
| Bird’s foot trefoil | Lotus corniculatus | Bee Fascinated | Feb 26, 2021 |
| Bison | Bison bison | Antlers & Horns | Aug 12, 2022 |
| Bitternut hickory | Carya cordiformus | Winter Tree ID, Pt.2 | Feb 19, 2021 |
| Bitternut hickory | Carya cordiformus | Oak-hickory Forest | Jul 14, 2023 |
| Black & white warbler | Mniotilta varia | Wood Warblers | Apr 22, 2022 |
| Black & yellow garden spider | Argiope aurantia | Orb Weavers | Nov 4, 2021 |
| Black ash tree | Fraxinus nigra | Ash Trees | Aug 11, 2023 |
| Blackburnian warbler | Setophaga fusca | Wood Warblers | Apr 22, 2022 |
| Black-capped chickadee | Poecile atracapillus | Backyard Birds | Oct 16, 2020 |
| Black-capped chickadee | Poecile atracapillus | Hibernation | Oct 23, 2020 |
| Black-capped chickadee | Poecile atracapillus | Backyard Birds | Feb 5, 2021 |
| Black-capped chickadee | Poecile atracapillus | Why Do Woodpeckers Peck Wood? | Dec 2, 2022 |
| Black cherry | Prunus serotina | Bark, pt.1 | Jan 21, 2022 |
| Black cherry | Prunus serotina | Oak-hickory Forest | Jul 14, 2023 |
| Black-chinned hummingbird | Archilobus alexandri | Hummingbirds | Aug 23, 2024 |
| Black-crowned night heron | Nycticorax nycticorax | Herons | May 1, 2020 |
| Black-eyed susan | Rudbeckia hirta | Summer Pollinator Bloom | Aug 7, 2020 |
| Black-eyed susan | Rudbeckia hirta | Autumn Seed Collecting | Sep 9, 2022 |
| Black-eyed susan | Rudbeckia hirta | American Asters | Oct 10, 2025 |
| Black firefly | Lucidota atra | Fireflies | Jun 26, 2020 |
| Black firefly | Lucidota atra | Fireflies | Jul 16, 2021 |
| Black-footed ferret | Mustela nigripes | Extinct & Endangered – pt.3 | Mar 8, 2024 |
| Black kite | Milvus migrans | Illinois Owls p.1 | Dec 13, 2024 |
| Black leaf fungus | Septoria spiculosa | Early Spring Blooms | Mar 25, 2022 |
| Black-legged tick; Deer tick | Ixodes scapularis | The Itch! | Aug 21, 2020 |
| Black maple tree | Acer nigrum | Sap & Syrup | Jan 29, 2021 |
| Black maple tree | Acer nigrum | Maple Trees | Apr 7, 2023 |
| Black maple seed | Acer nigrum | Seeds | Oct 1, 2021 |
| Black oak tree | Quercus velutina | Oak-hickory Forest | Jul 14, 2023 |
| Black raspberry | Rubus occidentalis | Greene Valley Trail | Jul 11, 2025 |
| Black skimmer | Rynchops niger | Bird Beaks | Nov 24, 2023 |
| Black swallowtail butterfly | Papilio polyxenes | Backyard Activites | Jul 17, 2020 |
| Black swallowtail butterfly | Papilio polyxenes | Common Milkweed Pollinators | Jul 8, 2022 |
| Black swallowtail butterfly | Papilio polyxenes | Coneflower | Jul 22, 2022 |
| Black swallowtail butterfly | Papilio polyxenes | Butterflies & Flowers | Aug 5, 2022 |
| Black-tailed jackrabbit | Lepus californicus | Beat The Heat | Aug 25, 2023 |
| Black-throated green warbler | Setophaga virens | Wood Warblers | Apr 22, 2022 |
| Black walnut tree | Juglans nigra | Winter Tree ID, Pt.2 | Feb 19, 2021 |
| Black walnut tree | Juglans nigra | Oak-hickory Forest | Jul 14, 2023 |
| Bloodroot | Sanguinaria canadensis | Spring Wildflowers | Apr 10, 2020 |
| Bloodroot | Sanguinaria canadensis | Oak-hickory Forest | Jul 14, 2023 |
| Bloodroot | Sanguinaria canadensis | Natives In Bloom | Apr 25, 2025 |
| Blowfly | Calliphoridae sp | Backyard Activites | Jul 17, 2020 |
| Blue aster | Symphyotrichum laeve | Asters | Oct 15, 2021 |
| Blue cohosh | Caulophyllum thalictorides | Early Spring Blooms | Mar 25, 2022 |
| Blue-headed vireo | Vireo solitarius | Sounds of Spring | May 9, 2025 |
| Blue jay | Cyanocitta cristata | Irruptions | Dec 18, 2020 |
| Blue jay | Cyanocitta cristata | Neighborhood Nests | May 28, 2021 |
| Blue jay | Cyanocitta cristata | Migration | Oct 28, 2022 |
| Blue Jay | Cyanocitta cristata | Oak Tree Habitat, pt.2 | Jul 12, 2024 |
| Blue Jay | Cyanocitta cristata | Sounds of Spring | May 9, 2025 |
| Blue morpho butterfly | Morpho peleides | Butterflies | Sep 27, 2024 |
| Blue salvia | Salvia azurea | Hummingbirds | May 15, 2020 |
| Blue-fruited dogwood tree | Cornus obliqua | Spring Wetland Vegetation | Apr 29, 2022 |
| Bluegill | Lepomis macrochirus | Illinois State Symbols, pt.2 | Sep 2, 2022 |
| Blue-joint grass | Calamagrostis canadensis | Spring Wetland Vegetation | Apr 29, 2022 |
| Blue-spotted salamander | Ambystoma laterale | Salamanders | Mar 4, 2022 |
| Blue-spotted salamander | Ambystoma laterale | Salamanders | Feb 14, 2025 |
| Blue-throated hummingbird | Lampornis clemenciae | Hummingbirds | Aug 23, 2024 |
| Blue-winged teal | Anas discors | Spring Migration | Feb 11, 2022 |
| Blue-winged teal | Anas discors | Bird Song | Feb 28, 2025 |
| Bohemian waxwing | Bombycilla garrulus | Irruptions | Dec 18, 2020 |
| Bolete mushroom | Boletus spp. | Forest Litter | Sep 16, 2022 |
| Borage | Borago officinalis | Bee Fascinated | Feb 26, 2021 |
| Boreal chorus frog | Pseudacris maculata | A Spring Walk | May 27, 2022 |
| Boreal chorus frog | Pseudacris maculata | Frog Calling | Mar 24, 2023 |
| Boreal chorus frog | Pseudacris maculata | Sounds of Spring | May 9, 2025 |
| Boston fern | Nephrolepsis exaltata | Ferns | May 26, 2023 |
| Box elder tree | Acer negundo | Maple Trees | Apr 7, 2023 |
| Bristly aster | Symphyotrichum puniceum | Asters | Oct 15, 2021 |
| Broad-billed hummingbird | Cynanthus latirostris | Hummingbirds | Aug 23, 2024 |
| Broad-leaved cattail | Typha latifolia | Cattails | Jul 2, 2021 |
| Broad-leaved cattail | Typha latifolia | Spring Wetland Vegetation | Apr 29, 2022 |
| Broad-shouldered hawk | Buteo platypterus | Hawks | Aug 28, 2020 |
| Broad-shouldered hawk | Buteo platypterus | Illinois Hawks | Oct 22, 2021 |
| Broad-tailed hummingbird | Selasphorus platycercus | Hummingbirds | Aug 23, 2024 |
| Brown-belted bumblebee | Bombus griseocollis | Bee-ginning B’s | Jun 5, 2020 |
| Brown clipper butterfly | Parthenos sylvia | Butterflies | Sep 27, 2024 |
| Brown-headed nuthatch | Sitta pusilla | Nuthatches | Mar 17, 2023 |
| Brown recluse | Loxosceles reclusa | Spiders | Oct 30, 2020 |
| Brown recluse | Loxosceles reclusa | Creepy Critters | Oct 21, 2022 |
| Brown-throated sloth | Bradypus variegatus | Sloths | Dec 23, 2022 |
| Buff-bellied hummingbird | Amazilia yucatanensis | Hummingbirds | Aug 23, 2024 |
| Bullfrog | Lithobates catesbeianus | Bullfrogs | Jul 10, 2020 |
| Bullfrog | Lithobates catesbeianus | Turnover | Mar 5, 2021 |
| Bullfrog | Lithobates catesbeianus | A Spring Walk | May 27, 2022 |
| Bullfrog | Lithobates catesbeianus | Backyard Sounds | Jun 24, 2022 |
| Bullfrog | Lithobates catesbeianus | Heat Effects | Jul 11, 2025 |
| Bumblebee | Bombus sp | Spring Wildflowers | Apr 10, 2020 |
| Bumblebee | Bombus sp | Bee An Early Pollinator | Apr 28, 2023 |
| Bur oak tree | Quercus macrocarpa | Acorns | Sep 24, 2021 |
| Bur oak tree | Quercus macrocarpa | Bark, pt.1 | Jan 21, 2022 |
| Bur oak tree | Quercus macrocarpa | Tree Buds | Feb 25, 2022 |
| Bur oak tree | Quercus macrocarpa | Oak-hickory Forest | Jul 14, 2023 |
| Bur oak tree | Quercus macrocarpa | Oak Tree Habitat, pt.1 | Jun 28, 2024 |
| Bushy aster | Symphyotrichum dumosum | Asters | Oct 15, 2021 |
| Butterfly weed | Asclepias tuberosa | Butterflies & Flowers | Aug 5, 2022 |
| Butterfly weed | Asclepias tuberosa | Autumn Seed Collecting | Sep 9, 2022 |
| Buttonbush | Cephalanthus occidentalis | Summer Pollinator Bloom | Aug 7, 2020 |
| Buttonbush | Cephalanthus occidentalis | Spring Wetland Vegetation | Apr 29, 2022 |
| Buttonbush | Cephalanthus occidentalis | Autumn Seed Collecting | Sep 9, 2022 |
| Buttonbush | Cephalanthus occidentalis | Buttonbush | Jul 28, 2023 |
| Cabbage white butterfly | Pieris rapae | Backyard Activites | Jul 17, 2020 |
| Cabbage white butterfly | Pieris rapae | Butterflies & Flowers | Aug 5, 2022 |
| Cactus deer mouse | Peromyscus eremicus | Desert Habitats, pt.3 | Nov 18, 2022 |
| Cactus wren | Campylorhynchus brunneicapillus | Desert Habitats, pt.3 | Nov 18, 2022 |
| Calico aster | Symphyotrichum lateriflorum | Asters | Oct 15, 2021 |
| California condor | Gymnogyps californianus | Extinct & Endangered – pt.3 | Mar 8, 2024 |
| Calliope hummingbird | Selasphorus calliope | Hummingbirds | Aug 23, 2024 |
| Canada geese | Branta canadensis | Migration | Oct 28, 2022 |
| Candleflame lichen | Candelaria concolor | Lichens | Jan 14, 2022 |
| Canada lynx | Lynx canadensis | Boreal Forest in Winter | Jan 13, 2023 |
| Cape cobra | Naja nives | Snake Defense | Dec 30, 2022 |
| Capybara | Hydrochoerus hydrochaeris | Rodents | Apr 26, 2024 |
| Cardinal flower | Lobelia cardinalis | Hummingbirds | May 15, 2020 |
| Cardinal flower | Lobelia cardinalis | Summer Pollinator Bloom | Aug 7, 2020 |
| Cardinal flower | Lobelia cardinalis | Autumn Seed Collecting | Sep 9, 2022 |
| Caribou | Rangifer sp | Arctic Adaptations | Dec 9, 2022 |
| Carolina mantis | Stagmomantis carolina | Praying Mantis | Nov 19, 2021 |
| Carolina parakeet | Conuropsis carolinensis | Extinct & Endangered | Feb 9, 2024 |
| Catmint | Nepeta faassenii | Backyard Activites | Jul 17, 2020 |
| Cave Salamander | Eurycea lucifuga | Salamanders | Feb 14, 2025 |
| Cecropia moth | Hyalophora cecropia | Insects Over Winter | Nov 8, 2024 |
| Cedar waxwing | Bombycilla cedrorum | Backyard Sounds | Jun 24, 2022 |
| Celandine poppy | Stylophorum diphyllum | Wildflowers, pt.2 | May 7, 2021 |
| Celandine poppy | Stylophorum diphyllum | A Spring Walk | May 27, 2022 |
| Celandine poppy | Stylophorum diphyllum | Natives In Bloom | Apr 25, 2025 |
| Centipede | Myriapoda sp | It’s Got Legs! | Jun 11, 2021 |
| Centipede | Myriapoda sp | Forest Litter, Critters To See | Sep 23, 2022 |
| Central newt | Notophthalmus viridescens | Salamanders | Mar 4, 2022 |
| Central newt | Notophthalmus viridescens | Salamanders | Feb 14, 2025 |
| Century plant | Agave americana | Desert Habitats, pt.2 | Nov 11, 2022 |
| Cephalopod | Placenticeras Placenta | Fossils of Illinois – part 2 | Jan 26, 2024 |
| Chanterell mushroom | Cantharellus spp. | Forest Litter | Sep 16, 2022 |
| Chinese mantis | Tenodera sinensis | Praying Mantis | Nov 19, 2021 |
| Chinook salmon | Oncorhynchus tshawytscha | Chinook | Oct 8, 2021 |
| Chipping sparrow | Spizella passerina | Sounds of Spring | May 9, 2025 |
| Christmas cactus | Schlumbergera sp | Succulents | Jul 15, 2022 |
| Christmas fern | Polystichum acrostichoides | Fern Fun | Jun 25, 2021 |
| Christmas fern | Polystichum acrostichoides | Ferns | May 26, 2023 |
| Cicada | Cicadoidea sp | Cicadas in Song | Jun 12, 2020 |
| Cicada | Cicadoidea sp | Night Buzzers | Sep 6, 2023 |
| Clematis | Clematis sp | Pollinator Garden | May 29, 2020 |
| Climbing prairie rose | Rosa setigera | Greene Valley Trail | Jul 11, 2025 |
| Coast live oak | Quercus agrifola | Oak Tree Habitat, pt.1 | Jun 28, 2024 |
| Coast sandalwood | Santalum ellipticum | Herbaria | Oct 14, 2022 |
| Cobra lily | Darlingtonia californica | Carnivorous Plants | Sep 8, 2023 |
| Colombian weasel | Neogale felipei | Weasels | Mar 10, 2023 |
| Columbine | Aquilegia sp | Hummingbirds | May 15, 2020 |
| Common alder | Alnus glutinosa | Boreal Forest in Winter | Jan 13, 2023 |
| Common beggar’s ticks | Bidens frondosa | Spring Wetland Vegetation | Apr 29, 2022 |
| Common buckeye butterfly | Junonia coenia | Butterflies & Flowers | Aug 5, 2022 |
| Common buckthorn | Rhamnus cathartica | Exotic Invasives | Apr 30, 2021 |
| Common bur reed | Sparganium eurycarpum | Spring Wetland Vegetation | Apr 29, 2022 |
| Common green bottle fly | Lucilia sericata | Backyard Activites | Jul 17, 2020 |
| Common ironweed | Vernonia fasciculata | Summer Pollinator Bloom | Aug 7, 2020 |
| Common ironweed | Vernonia fasciculata | Autumn Seed Collecting | Sep 9, 2022 |
| Common loon | Gavia immer | Bird Song | Feb 28, 2025 |
| Common milkweed | Asclepias syriaca | Common Milkweed Pollinators | Jul 8, 2022 |
| Common milkweed | Asclepias syriaca | Butterflies & Flowers | Aug 5, 2022 |
| Common milkweed | Asclepias syriaca | Autumn Seed Collecting | Sep 9, 2022 |
| Common milkweed | Asclepias syriaca | Greene Valley Trail | Jul 11, 2025 |
| Common mudpuppy | Necturus maculosus | Salamanders | Mar 4, 2022 |
| Common ostrich | Struthio camelus | Ostrich | Oct 11, 2024 |
| Common pill-bug | Armadillidium vulgare | Insects Over Winter | Nov 8, 2024 |
| Common redpoll | Acanthis flammea | Spring Migration | Feb 11, 2022 |
| Common reed | Phragmites australis | Spring Wetland Vegetation | Apr 29, 2022 |
| Common snowdrops; White-throated snowdrops | Galanthus nivalis | Early Spring Blooms | Mar 25, 2022 |
| Common starling | Sturnus vulgaris | Why Do Woodpeckers Peck Wood? | Dec 2, 2022 |
| Common stonefly | Paragnetina media | Aquatic Insects | Feb 24, 2023 |
| Common yellowthroat | Geothlypis trichas | Greene Valley Trail | Jul 11, 2025 |
| Compass plant | Silphium laciniatum | Silphium | Sep 3, 2021 |
| Coneflower | Echinacea | American Asters | Oct 10, 2025 |
| Connecticut warbler | Oporornis agilis | Wood Warblers | Apr 22, 2022 |
| Convergent lady-beetle | Hippodamia convergens | Ladybugs | Aug 6, 2021 |
| Cooper’s hawk | Accipiter cooperii | Hawks | Aug 28, 2020 |
| Cooper’s hawk | Accipiter cooperii | Backyard Birds | Feb 5, 2021 |
| Cooper’s hawk | Accipiter cooperii | Illinois Hawks | Oct 22, 2021 |
| Cooper’s hawk | Accipiter cooperii | Cooper’s Hawk | Dec 10, 2021 |
| Coral bells | Heuchera sp | Hummingbirds | May 15, 2020 |
| Coral mushroom | Ramaria spp. | Forest Litter | Sep 16, 2022 |
| Corn | Illinois State Symbols, pt.1 | Aug 26, 2022 | |
| Costa’s hummingbird | Calypte costae | Hummingbirds | Aug 23, 2024 |
| Coyote | Canis latrans | Nocturnal Animals | Jul 24, 2020 |
| Coyote | Canis latrans | Sounds of Spring | May 9, 2025 |
| Coyote | Canis latrans | Greene Valley Trail | Jul 11, 2025 |
| Crab (fossil) | Zanthopsis vulgaris | Fossils of Illinois – part 2 | Jan 26, 2024 |
| Crane fly | Tipulidae sp | Backyard Activites | Jul 17, 2020 |
| Crane fly | Tipuladea sp | Aquatic Insects | Feb 24, 2023 |
| Creosote bush | Larrea tridentata | Desert Habitats, pt.2 | Nov 11, 2022 |
| Crickets sp | Orthoptera | Crickets | Sep 10, 2021 |
| Crinoid | Dichocrinus inornatus | Fossils of Illinois | Jan 12, 2024 |
| Crocus | Crocus vernus | Early Spring Blooms | Mar 25, 2022 |
| Cuban sandhill crane | Antigone canadensis nesiotes | Sandhill Cranes | Mar 19, 2021 |
| Cup fungus | Peziza domiciliana | Mushrooms | May 6, 2022 |
| Cup fungus | Peziza domiciliana | Forest Litter | Sep 16, 2022 |
| Cup plant | Silphium perfoliatum | Silphium | Sep 3, 2021 |
| Cup plant | Silphium perfoliatum | Greene Valley Trail | Jul 11, 2025 |
| Cutleaf toothwort | Dentaria laciniata | Wildflowers, pt. 1 | Apr 23, 2021 |
| Cutleaf toothwort | Cardamine concatenata | Natives In Bloom | Apr 25, 2025 |
| Daffodil | Narcissus sp | Early Spring Blooms | Mar 25, 2022 |
| Dandelion seed | Taraxacum officinale | Seeds | Oct 1, 2021 |
| Dandelion seed | Taraxacum officinale | Herbaria | Oct 14, 2022 |
| Dark-eyed junco | Junco hyemalis | American Asters | Oct 10, 2025 |
| Dark-sided salamander | Eurycea longicauda meanopleura | Salamanders | Feb 14, 2025 |
| Deadly nightshade | Atropa belladonna | Dangerous Plants | Aug 13, 2021 |
| Decapod | Acanthochirus longipes | Fossils of Illinois | Jan 12, 2024 |
| Decapod | Paneus sp. | Fossils of Illinois | Jan 12, 2024 |
| Declined trillium | Trillium flexipes | Trillium | May 14, 2021 |
| Deer tick; Black-legged tick | Ixodes scapularis | The Itch! | Aug 21, 2020 |
| Desert globemallow | Sphaeralcea ambigua | Desert Habitats, pt.1 | Nov 4, 2022 |
| Desert woollystar | Eriastrum eremicum | Desert Habitats, pt.1 | Nov 4, 2022 |
| Differential grasshopper | Melanoplus differntialis | Grasshoppers | Jul 23, 2021 |
| Dill | Anethum graveolens | Backyard Activites | Jul 17, 2020 |
| Dill | Anethum graveolens | Butterflies & Flowers | Aug 5, 2022 |
| Dill seeds | Anethum graveolens | Herbaria | Oct 14, 2022 |
| Dinosaur | Diplomystus dentatus | Dinosaurs At The Museum | Oct 27, 2023 |
| Dinosaur | Diplomystus analis | Dinosaurs At The Museum | Oct 28, 2023 |
| Dinosaur | Edmontosaurus | Dinosaurs At The Museum | Oct 29, 2023 |
| Dinosaur | Knightia alta | Dinosaurs At The Museum | Oct 30, 2023 |
| Dinosaur | Mioplosus | Dinosaurs At The Museum | Oct 31, 2023 |
| Dinosaur | Notogonius oscuius | Dinosaurs At The Museum | Nov 1, 2023 |
| Dinosaur | Perca obtusa | Dinosaurs At The Museum | Nov 2, 2023 |
| Dinosaur | Phareodus testis | Dinosaurs At The Museum | Nov 3, 2023 |
| Dinosaur | Priscacara liops | Dinosaurs At The Museum | Nov 4, 2023 |
| Dinosaur | Icthyosaur Stenopterygius | Dinosaurs At The Museum | Nov 5, 2023 |
| Dinosaur | Pterosaur Phyllurus | Dinosaurs At The Museum | Nov 6, 2023 |
| Dinosaur | Triceratops | Dinosaurs At The Museum | Nov 7, 2023 |
| Dinosaur | Tyrannosaurus rex | Dinosaurs At The Museum | Nov 8, 2023 |
| Dinosaur | Diplomystus dentatus | Fossils of Illinois | Jan 12, 2024 |
| Dinosaur | Diplomystus analis | Fossils of Illinois | Jan 13, 2024 |
| Dinosaur | Knightia alta | Fossils of Illinois | Jan 14, 2024 |
| Dinosaur | Mioplosus | Fossils of Illinois | Jan 15, 2024 |
| Dinosaur | Notogonius oscuius | Fossils of Illinois | Jan 16, 2024 |
| Dinosaur | Phareodus testis | Fossils of Illinois | Jan 17, 2024 |
| Dinosaur | Rauna angusta | Fossils of Illinois | Jan 18, 2024 |
| Dinosaur | Icthyosaur | Fossils of Illinois – part 2 | Jan 26, 2024 |
| Dinosaur | Nothosaurus | Fossils of Illinois – part 3 | Jan 27, 2024 |
| Dinosaur | Pecopterisd miltoni Perca obtusa | Fossils of Illinois – part 4 | Jan 28, 2024 |
| Dinosaur | Priscacara liops | Fossils of Illinois – part 5 | Jan 29, 2024 |
| Dinosaur | Pterosaur Phyllurus | Fossils of Illinois – part 6 | Jan 30, 2024 |
| Dolostone | Illinois State Symbols, pt.1 | Aug 26, 2022 | |
| Downy woodpecker | Dryobates pubescens | Woodpeckers | Jul 31, 2020 |
| Downy woodpecker | Dryobates pubescens | Backyard Birds | Feb 5, 2021 |
| Downy woodpecker | Dryobates pubescens | Bird Nests | Mar 12, 2021 |
| Downy woodpecker | Dryobates pubescens | Why Do Woodpeckers Peck Wood? | Dec 2, 2022 |
| Dragon fish | Eurypegasus spp | The Deep Ocean | Apr 14, 2023 |
| Drummer silty clay loam | Illinois State Symbols, pt.1 | Aug 26, 2022 | |
| Drummond’s aster | Symphyotrichum drummondii | Asters | Oct 15, 2021 |
| Duckweed | Lemna sp | Spring Wetland Vegetation | Apr 29, 2022 |
| Duckweed | Lemna sp | Duck Potato Salad | Jan 20, 2023 |
| Duckweed | Nuphar sp | Spring Wetland Vegetation | Apr 29, 2022 |
| Duckweed | Nymphaea sp | Spring Wetland Vegetation | Apr 29, 2022 |
| Dusky salamander | Desmognathus fuscus conanti | Salamanders | Feb 14, 2025 |
| Dutchman’s breeches | Dicentra cucullaria | Spring Wildflowers | Apr 10, 2020 |
| Dutchman’s breeches | Dicentra cucullaria | Natives In Bloom | Apr 25, 2025 |
| Dwarf caiman | Paleosuchus palpebrosus | Crocodilians, pt.1 | Apr 1, 2022 |
| Dwarf caiman | Paleosuchus palpebrosus | Crocodilians, pt.2 | Apr 8, 2022 |
| Dwarf caiman | Paleosuchus palpebrosus | Crocodilians, pt.3 | Apr 15, 2022 |
| Eastern black walnut | Juglans nigra | Greene Valley Trail | Jul 11, 2025 |
| Eastern bluebird | Sialia sialis | Spring Migration | Feb 11, 2022 |
| Eastern bluebird | Sialia sialis | Bird Song | Feb 28, 2025 |
| Eastern bumblebee | Bombus impatiens | Pumpkins | Sep 25, 2020 |
| Eastern chipmunk | Tamias striatus | Hibernation | Oct 23, 2020 |
| Eastern chipmunk | Tamias striatus | Chipmunks | Jun 18, 2021 |
| Eastern chipmunk | Tamias striatus | Backyard Sounds | Jun 24, 2022 |
| Eastern chipmunk | Tamias striatus | Happy Thanksgiving 2022 | Nov 25, 2022 |
| Eastern copperhead | Agkistrodon contortrix | Snake Defense | Dec 30, 2022 |
| Eastern copperhead | Agkistrodon contortrix | Venomous Reptiles Of Illinois | Jul 25, 2025 |
| Eastern coral snake | Micrurus fulvius | Snake Defense | Dec 30, 2022 |
| Eastern cottontail | Sylvilagus floridanus | Greene Valley Trail | Jul 11, 2025 |
| Eastern cottonwood | Populus deltoides | Bark, pt.1 | Jan 21, 2022 |
| Eastern fox squirrel | Sciurus niger | Squirrels | Nov 6, 2020 |
| Eastern Garter Snake | Thamnophis sirtalis | Garter Snakes | Apr 17, 2020 |
| Eastern Garter Snake | Thamnophis sirtalis | A Spring Walk | May 27, 2022 |
| Eastern grey squirrel | Sciurus carolinensis | Squirrels | Nov 6, 2020 |
| Eastern grey squirrel | Sciurus carolinensis | Happy Thanksgiving 2022 | Nov 25, 2022 |
| Eastern grey squirrel | Sciurus carolinensis | Rodents | Apr 26, 2024 |
| Eastern grey squirrel | Sciurus carolinensis | Oak Tree Habitat, pt.2 | Jul 12, 2024 |
| Eastern grey squirrel | Sciurus carolinensis | Squirrels of Illinois | Aug 8, 2025 |
| Eastern Kingbird | Tyrannus carolinensis | Migration | Oct 28, 2022 |
| Eastern milk snake | Lampropeltis triangulum triangulum | Illinois State Symbols, pt.2 | Sep 2, 2022 |
| Eastern redbud | Cercis canadensis | Natives In Bloom | Apr 25, 2025 |
| Eastern screech owl | Megascops asio | Nocturnal Animals | Jul 24, 2020 |
| Eastern screech owl | Megascops asio | Illinois Owls p.2 | Dec 27, 2024 |
| Eastern tiger salamander | Ambystoma tigrinum | Illinois State Symbols, pt.2 | Sep 2, 2022 |
| Eastern tiger swallowtail butterfly | Papilio glaucus | Summer Pollinator Bloom | Aug 7, 2020 |
| Eastern tiger swallowtail butterfly | Papilio glaucus | Common Milkweed Pollinators | Jul 8, 2022 |
| Eastern tiger swallowtail butterfly | Papilio glaucus | Butterfly Defense | Jul 29, 2022 |
| Eastern tiger swallowtail butterfly | Papilio glaucus | Butterflies & Flowers | Aug 5, 2022 |
| Eastern whippoorwill | Antrostomus vociferus | Bird Beaks | Nov 24, 2023 |
| Eastern yellow fly agaric | Amanita muscaria | Mushrooms | May 6, 2022 |
| Eastern yellow jacket wasp | Vespula maculifrons | The Itch! | Aug 21, 2020 |
| Ebony jewelwing | Calopteryx maculata | Naiad | Apr 24, 2020 |
| Echidna | Family: Tachyglossidae | Fancy Hair | Mar 28, 2025 |
| Elderberry | Sambucus sp | Backyard Sounds | Jun 24, 2022 |
| Elderberry | Sambucus sp | Greene Valley Trail | Jul 11, 2025 |
| Elephant | Elaphas sp. | A Big, Cool One | Jan 27, 2023 |
| Elephant | Elaphas sp. | At The Waterhole | Feb 3, 2023 |
| Elk | Cervis elaphus canadensis | Antlers & Horns | Aug 12, 2022 |
| Emerald ash borer | Agrilus planipennis | Ash Trees | Aug 11, 2023 |
| Eskimo curlew | Numenius borealis | Extinct & Endangered pt.2 | Feb 23, 2024 |
| Eurasian curlew | Numenius arquata | Bird Beaks | Nov 24, 2023 |
| Expressway aster | Symphyotrichum sp | Asters | Oct 15, 2021 |
| Fall webworm | Hyphantria cunea | Oak Tree Habitat, pt.3 | Jul 26, 2024 |
| False blister beetle | Oedemeridae sp | Spring Wildflowers | Apr 10, 2020 |
| Fangtooth fish | Anoplogaster cornuta | The Deep Ocean | Apr 14, 2023 |
| Fennec fox | Vulpes zerda | Beat The Heat | Aug 25, 2023 |
| Field Cricket | Gryllus ssp | Night Buzzers | Sep 6, 2023 |
| Field sparrow | Spizella pusilla | Greene Valley Trail | Jul 11, 2025 |
| Fir pink | Silene virginica | Hummingbirds | May 15, 2020 |
| Firefly | Lampyriae family | Heat Effects | Jul 11, 2025 |
| Flatback sea turtle | Natator depressus | Sea Turtles | Dec 8, 2023 |
| Florida sandhill crane | Grus canadensis pratensis | Sandhill Cranes | Mar 19, 2021 |
| Fluorite | Illinois State Symbols, pt.1 | Aug 26, 2022 | |
| Four-lined plant bug | Poecilocapsus lineatus | Insects Over Winter | Nov 8, 2024 |
| Four-toed salamander | Hemidactulium scutatum | Salamanders | Feb 14, 2025 |
| Fox squirrel | Sciurus niger | Squirrels of Illinois | Aug 8, 2025 |
| Franklin’s ground squirrel | Spermophilus franklinii | Chipmunks | Jun 18, 2021 |
| Freeman maple tree | Acer fremanii | Tree Buds | Feb 25, 2022 |
| Fur seal | Arctocephalus sp | Arctic Adaptations | Dec 9, 2022 |
| Garlic mustard | Alliaria petiolata | Wildflowers, pt. 1 | Apr 23, 2021 |
| Garlic mustard | Alliaria petiolata | Exotic Invasives | Apr 30, 2021 |
| Gharial | Gavialus gangeticus | Crocodilians, pt.1 | Apr 1, 2022 |
| Gharial | Gavialus gangeticus | Crocodilians, pt.2 | Apr 8, 2022 |
| Giant hogweed | Heracleum mantegazzianum | Dangerous Plants | Aug 13, 2021 |
| Giant millipede | Arthropleura | Fossils of Illinois – part 2 | Jan 26, 2024 |
| Giant snowdrops; Green-throated snowdrops | Galanthus elwesii | Early Spring Blooms | Mar 25, 2022 |
| Giant swallowtail butterfly | Papilio thoas | Butterflies | Sep 27, 2024 |
| Gila monster | Heloderma suspectum | Extinct & Endangered – pt.3 | Mar 8, 2024 |
| Gila monster | Heloderma suspectum | Desert Habitats, pt.3 | Nov 18, 2022 |
| Ginkgo tree | Ginkgo biloba | Tree Buds | Feb 25, 2022 |
| Giraffe | Giraffa camelopardalis | Giraffes | Oct 29, 2021 |
| Glowworm | Lampyris noctiluca | Fireflies | Jun 26, 2020 |
| Goat | Capra hircus | Antlers & Horns | Aug 12, 2022 |
| Golden Alexanders | Zizia aurea | Pollinator Garden | May 29, 2020 |
| Golden Alexanders | Zizia aurea | A Spring Walk | May 27, 2022 |
| Golden Alexanders | Zizia aurea | Autumn Seed Collecting | Sep 9, 2022 |
| Golden eagle | Aquila chrysaetos | Eagles | Jan 8, 2021 |
| Golden eagle | Aquila chrysaetos | Migration | Oct 28, 2022 |
| Golden eagle | Aquila chrysaetos | Illinois Owls p.1 | Dec 13, 2024 |
| Golden-crowned kinglet | Regulus satrapa | Spring Migration | Feb 11, 2022 |
| Golden millipede | Orthoporus ornatus | Oak Tree Habitat, pt.2 | Jul 12, 2024 |
| Goldenrod | Solidago spp. | American Asters | Oct 10, 2025 |
| Gold-rush apple | Illinois State Symbols, pt.1 | Aug 26, 2022 | |
| Gray catbird | Dumetella carolinensis | Greene Valley Trail | Jul 11, 2025 |
| Gray tree frog | Dryophytes versicolor | A Spring Walk | May 27, 2022 |
| Gray tree frog | Dryophytes versicolor | Frog Calling | Mar 24, 2023 |
| Gray-headed coneflower; Yellow coneflower | Ratabida pinnata | Summer Pollinator Bloom | Aug 7, 2020 |
| Gray-headed coneflower; Yellow coneflower | Ratabida pinnata | Coneflower | Jul 22, 2022 |
| Gray-headed coneflower; Yellow coneflower | Ratabida pinnata | Midwestern Prairie | Nov 10, 2023 |
| Gray-headed coneflower; Yellow coneflower | Ratabida pinnata | Greene Valley Trail | Jul 11, 2025 |
| Great blue heron | Ardea herodias | Herons | May 1, 2020 |
| Great blue heron | Ardea herodias | Backyard Sounds | Jun 24, 2022 |
| Great blue heron | Ardea herodias | Snake Defense | Dec 30, 2022 |
| Great egret | Ardea alba | Herons | May 1, 2020 |
| Great-horned owl | Bubo virginianus | Illinois Owls p.1 | Dec 13, 2024 |
| Great-horned owl | Bubo virginianus | Illinois Owls p.2 | Dec 27, 2024 |
| Great-horned owl | Bubo virginianus | Great Horned Owl | Apr 11, 2025 |
| Great spangled fritillary | Speyeria cybele | Summer Pollinator Bloom | Aug 7, 2020 |
| Greater flamingo | Phoenicopterus roseus | Flamingos | Feb 10, 2023 |
| Greater roadrunner | Geococcyx californianus | Desert Habitats, pt.3 | Nov 18, 2022 |
| Greater sandhill crane | Antigone canadensis tabida | Sandhill Cranes | Mar 19, 2021 |
| Green ash tree | Fraxinus pennsylvanica | Oak-hickory Forest | Jul 14, 2023 |
| Green ash tree | Fraxinus pennsylvanica | Ash Trees | Aug 11, 2023 |
| Green algae | Chlorophyta sp | Duck Potato Salad | Jan 20, 2023 |
| Green dragon | Arisaema dracontium | Wildflowers, pt.2 | May 7, 2021 |
| Green dragon | Arisaema dracontium | A Spring Walk | May 27, 2022 |
| Green dragon | Arisaema dracontium | Autumn Seed Collecting | Sep 9, 2022 |
| Green frog | Rana clamitans | Nocturnal Animals | Jul 24, 2020 |
| Green heron | Butorides virescens | Herons | May 1, 2020 |
| Green-throated snowdrops; Giant snowdrops | Galanthus elwesii | Early Spring Blooms | Mar 25, 2022 |
| Green sea turtle | Chelonia mydas | Sea Turtles | Dec 8, 2023 |
| Grey poplar | Populus x canescens | Greene Valley Trail | Jul 11, 2025 |
| Grizzly bear | Ursus arctos | Bear bones | Jan 10, 2025 |
| Groundhog; Woodchuck | Marmota monax | Hibernation | Oct 23, 2020 |
| Groundhog; Woodchuck | Marmota monax | Chipmunks | Jun 18, 2021 |
| Gulf coast tick | Amblyomma maculatum | The Itch! | Aug 21, 2020 |
| Gulf fritillary | Dione vanillae | American Asters | Oct 10, 2025 |
| Gulper eel | Eurypharynx pelecanoides | The Ocean Deep | Apr 14, 2023 |
| Hackberry tree | Celtis occidentalis | Winter Tree ID, Pt.2 | Feb 19, 2021 |
| Hackberry tree | Celtis occidentalis | Bark, pt.2 | Jan 28, 2022 |
| Hair aster | Symphyotrichum pilosum | Asters | Oct 15, 2021 |
| Hairy woodpecker | Leuconotopicus villosus | Woodpeckers | Jul 31, 2020 |
| Hairy woodpecker | Leuconotopicus villosus | Backyard Birds | Feb 5, 2021 |
| Hairy woodpecker | Leuconotopicus villosus | Bird Nests | Mar 12, 2021 |
| Hairy woodpecker | Leuconotopicus villosus | Why Do Woodpeckers Peck Wood? | Dec 2, 2022 |
| Harvestmen | Opiliones spp. | Forest Litter, Critters To See | Sep 23, 2022 |
| Hawksbill sea turtle | Eretmochelys imbricata | Sea Turtles | Dec 8, 2023 |
| Heart-leaved aster | Symphyotrichum cordifolium | Asters | Oct 15, 2021 |
| Heath aster | Symphyotrichum ericoides | Asters | Oct 15, 2021 |
| Heath hen | Tympanuchus cupido cupido | Extinct & Endangered | Feb 9, 2024 |
| Hedgehog | Family: Erinaceidea | Fancy Hair | Mar 28, 2025 |
| Hedgehog cactus | Echinocereus sp | Desert Habitats, pt.1 | Nov 4, 2022 |
| Hellbender | Cryptobranchus alleganiensis alleganiensis | Salamanders | Feb 14, 2025 |
| Hemp dogbane | Apocynum cannabinum | Greene Valley Trail | Jul 11, 2025 |
| Himalayan vulture | Gyps himalayensis | Pamir Wildlife | Mar 14, 2025 |
| Hoary bat | Lasiurus cinereus | Desert Habitats, pt.3 | Nov 18, 2022 |
| Hoffman’s two-toed sloth | Choloepus hoffmanni | Sloths | Dec 23, 2022 |
| Honeybee | Apis mellifera | Backyard Activites | Jul 17, 2020 |
| Honeybee | Apis mellifera | Bee An Early Pollinator | Apr 28, 2023 |
| Honeybee | Apis mellifera | Insects Over Winter | Nov 8, 2024 |
| Hooded sunburst lichen | Xanthomendoza fallax | Lichens | Jan 14, 2022 |
| Horned puffin | Fratercula corniculata | Puffins | Sep 22, 2023 |
| Horned Toad | Phrynosoma sp | Desert Habitats, pt.3 | Nov 18, 2022 |
| Horsetail | Equisetum arvense | Spring Wetland Vegetation | Apr 29, 2022 |
| House finch | Haemorhouse mexicanus | Backyard Birds | Oct 16, 2020 |
| House sparrow | Passer domesticus | Backyard Birds | Feb 5, 2021 |
| House sparrow | Passer domesticus | Bird Nests | Mar 12, 2021 |
| House sparrow | Passer domesticus | Backyard Sounds | Jun 24, 2022 |
| Houstonia | Houstonia sp | Pollinator Garden | May 29, 2020 |
| Hoverfly | Toxomerus sp | Carnivorous Plants | Sep 8, 2023 |
| Human | Homo Sapien | Beat The Heat | Aug 25, 2023 |
| Hummingbird moth | Hemaris thysbe | Common Milkweed Pollinators | Jul 8, 2022 |
| Humpback whale | Megaptera novaeangliae | Baleen Whales | Oct 25, 2024 |
| Indian grass | Sorghastrum nutans | Autumn Grass | Sep 17, 2021 |
| Indian grass | Sorghastrum nutans | Midwestern Prairie | Nov 10, 2023 |
| Indiana bat | Myotis sodalis | Bats | May 8, 2020 |
| Indiana bat | Myotis sodalis | Nocturnal Animals | Jul 24, 2020 |
| Indigo bunting | Passerina cyanea | American Asters | Oct 10, 2025 |
| Interrupted fern | Osmunda claytoniana | Fern Fun | Jun 25, 2021 |
| Isopod; woodlice; pillbug | Isopoda spp. | Forest Litter, Critters To See | Sep 23, 2022 |
| Jack-In-The-Pulpit | Arisaema triphyllum | Wildflowers, pt.2 | May 7, 2021 |
| Jack-in-the-Pulpit | Arisaema triphyllum | A Spring Walk | May 27, 2022 |
| Jack-in-the-Pulpit | Arisaema triphyllum | Autumn Seed Collecting | Sep 9, 2022 |
| Jack-in-the-Pulpit | Arisaema triphyllum | Oak-hickory Forest | Jul 14, 2023 |
| Jack-In-The-Pulpit seed | Arisaema triphyllum | Seeds | Oct 1, 2021 |
| Jacob’s ladder | Polemonium caeruleum | Pollinator Garden | May 29, 2020 |
| Jade plant | Crassula ovata | Succulents | Jul 15, 2022 |
| Japanese beetle | Popillia japonica | Backyard Activites | Jul 17, 2020 |
| Japanese giant spider crab | Macrocheira kaempferi | The Ocean Deep | Apr 14, 2023 |
| Javelina | Tayassu tajacu | Desert Habitats, pt.3 | Nov 18, 2022 |
| Jelly fungus | Agaricomycotina spp. | Forest Litter | Sep 16, 2022 |
| Joe Pye weed | Eutrochium sp | Greene Valley Trail | Jul 11, 2025 |
| Joshua tree | Yucca brevifolia | Desert Habitats, pt.2 | Nov 11, 2022 |
| Julia butterfly | Dryas julia | Butterflies | Sep 27, 2024 |
| Junco | Junco hyemalis | Backyard Birds | Feb 5, 2021 |
| Junco | Junco hyemalis | Migration | Oct 28, 2022 |
| Junco | Junco hyemalis | Junco Winter Adaptations | Jan 3, 2023 |
| Kangaroo rat | Dipodomys sp | Rodents | Apr 26, 2024 |
| Katydid | Tettigonlidae sp | Night Buzzers | Sep 6, 2023 |
| Kemp’s ridley sea turtle | Lepidochelys kempii | Sea Turtles | Dec 8, 2023 |
| Killdeer | Charadrius vociferus | Spring Migration | Feb 11, 2022 |
| Kodiak bear | Ursus arctos middendorffi | Bear Bones | Jan 10, 2025 |
| Lanternfish | Symbolophorus spp | The Ocean Deep | Apr 14, 2023 |
| Large-flowered trillium | Trillium grandiflorum | Trillium | May 14, 2021 |
| Large-flowered trillium | Trillium grandiflorum | Natives In Bloom | Apr 25, 2025 |
| Leaf-cutter bee | Megachile spp. | American Asters | Oct 10, 2025 |
| Least shrew | Cryptotis parva | Oh To Be So Shrew-d | Jun 4, 2021 |
| Least weasel | Mustela nivalis | Weasels | Mar 10, 2023 |
| Leatherback sea turtle | Dermochelys coriacea | Sea Turtles | Dec 8, 2023 |
| Lesser sandhill crane | Antigone canadensis canadensis | Sandhill Cranes | Mar 19, 2021 |
| Linden looper caterpillar | Erannis tillaria | Oak Tree Habitat, pt.3 | Jul 26, 2024 |
| Linnaeus’s two-toed sloth | Choloepus didactylus | Sloths | Dec 23, 2022 |
| Little bluestem | Schizachyrium scoparium | Autumn Grass | Sep 17, 2021 |
| Little brown bat | Myotis lucifugus | Bats | May 8, 2020 |
| Live oak | Quercus virginiana | Oak Tree Habitat, pt.1 | Jun 28, 2024 |
| Loggerhead sea turtle | Caretta caretta | Sea Turtles | Dec 8, 2023 |
| Loggerhead shrike | Lanus ludovicianus | Bird Song | Feb 28, 2025 |
| Lone star tick | Amblyomma americanum | The Itch! | Aug 21, 2020 |
| Long-billed curlew | Numenius americanus | Bird Beaks | Nov 24, 2023 |
| Long-eared owl | Asio otus | Illinois Owls p.2 | Dec 27, 2024 |
| Long-tailed salamander | Eurycea longicauda longicauda | Salamanders | Feb 14, 2025 |
| Long-tailed weasel | Mustela frenata | Weasels | Mar 10, 2023 |
| Lord Howe Island apple tree | Dysoxylum pachyphyllum | Herbaria | Oct 14, 2022 |
| Lucifer hummingbird | Calothorax lucifer | Hummingbirds | Aug 23, 2024 |
| Magnolia warbler | Setophaga magnolia | Wood Warblers | Apr 22, 2022 |
| Malachite butterfly | Siproeta stelenes | Butterflies | Sep 27, 2024 |
| Mallard | Anas platyrhynchos | A Spring Walk | May 27, 2022 |
| Mallard | Anas platyrhynchos | Bird Beaks | Nov 24, 2023 |
| Marbled salamander | Ambystoma opacum | Salamanders | Feb 14, 2025 |
| Marco Polo sheep | Ovis ammon polii | Pamir Wildlife | Mar 14, 2025 |
| Marsh smartweed | Persicaria amphibia | Spring Wetland Vegetation | Apr 29, 2022 |
| Marsh wren | Cistothorus palustris | Cattails | Jul 2, 2021 |
| Masked shrew | Sorex cinereus | Oh To Be So Shrew-d | Jun 4, 2021 |
| Massasauga rattlesnake | Sistrurus catenatus | Venomous Reptiles Of Illinois | Jul 25, 2025 |
| Mayapple | Podophyllum peltatum | Wildflowers, pt.2 | May 7, 2021 |
| Mayapple | Podophyllum peltatum | Natives In Bloom | Apr 25, 2025 |
| Mayfly | Prosopistoma | Aquatic Insects | Feb 24, 2023 |
| Metallic green bee | Agapostemon spp. | American Asters | Oct 10, 2025 |
| Metallic green sweat fly | Agapostemon sericeus | Carnivorous Plants | Sep 8, 2023 |
| Midland brown snake | Storeria dekayi | Snake Monitoring | Jun 19, 2020 |
| Milkweed | Aesclepias spp | Illinois State Symbols, pt.1 | Aug 26, 2022 |
| Milkweed beetle | Oncopeltus fasciatus | Insects Over Winter | Nov 8, 2024 |
| Millipede | Myriapoda sp | It’s Got Legs! | Jun 11, 2021 |
| Millipede | Myriapoda sp | Forest Litter, Critters To See | Sep 23, 2022 |
| Mining bee | Andrena nigrihirta | Carnivorous Plants | Sep 8, 2023 |
| Mischievous bird grasshopper | Schistocerca damnifica | Grasshoppers | Jul 23, 2021 |
| Mississippi sandhill crane | Antigone canadensis pulla | Sandhill Cranes | Mar 19, 2021 |
| Miyabe maple tree | Acer miyabei | Tree Buds | Feb 25, 2022 |
| Mulberry | Molus app | Summer Berries | Jun 14, 2023 |
| Red Mulberry | Molus rubra | Summer Berries | Jun 14, 2023 |
| White Mulberry | Molus alba | Summer Berries | Jun 14, 2023 |
| Mole salamander | Ambystoma talpoideum | Salamanders | Feb 14, 2025 |
| Monarch butterfly | Danaus plexippus | Backyard Activites | Jul 17, 2020 |
| Monarch butterfly | Danaus plexippuss | Summer Pollinator Bloom | Aug 7, 2020 |
| Monarch butterfly | Danaus plexippus | Common Milkweed Pollinators | Jul 8, 2022 |
| Monarch butterfly | Danaus plexippus | Butterfly Defense | Jul 29, 2022 |
| Monarch butterfly | Danaus plexippus | Butterflies & Flowers | Aug 5, 2022 |
| Monarch butterfly | Danaus plexippus | Illinois State Symbols, pt.2 | Sep 2, 2022 |
| Monarch butterfly | Danaus plexippus | Butterflies | Sep 27, 2024 |
| Monarch butterfly | Danaus plexippus | Insects Over Winter | Nov 8, 2024 |
| Moon jelly | Aurelia aurita | Moon Jellies | Dec 3, 2021 |
| Moose | Alces alces | Antlers & Horns | Aug 12, 2022 |
| Moose | Alces alces | Arctic Adaptations | Dec 9, 2022 |
| Mosquito | Culex pipiens | The Itch! | Aug 21, 2020 |
| Mourning dove | Zenaida macroura | Backyard Birds | Oct 16, 2020 |
| Mourning dove | Zenaida macroura | Backyard Birds | Feb 5, 2021 |
| Mourning warbler | Geothlypis philadelphia | Wood Warblers | Apr 22, 2022 |
| Mud puppy | Necturus maculosus maculosus | Salamanders | Feb 14, 2025 |
| Mule deer | Odocoileus hemionus | Antlers & Horns | Aug 12, 2022 |
| Musk ox | Ovibus moschatus | Arctic Adaptations | Dec 9, 2022 |
| Naked mole-rat | Heterocephalus glaber | Rodents | Apr 26, 2024 |
| Narrow-leaved cattail | Typha angustifolia | Cattails | Jul 2, 2021 |
| Narrow-leaved cattail | Typha angustifolia | Spring Wetland Vegetation | Apr 29, 2022 |
| Nashville warbler | Leiothylpis ruficapilla | Wood Warblers | Apr 22, 2022 |
| Nautilus | Nautilus sp | Fossils of Illinois – part 2 | Jan 26, 2024 |
| New England aster | Symphyotrichum novae-angliae | Asters | Oct 15, 2021 |
| New England aster | Symphyotrichum nocae-angliae | American Asters | Oct 10, 2025 |
| New Zealand gloxinia | Negria rhabdothamnoides | Herbaria | Oct 14, 2022 |
| Niger | Guizotia abyssinica | Backyard Birds | Feb 5, 2021 |
| Nile crocodile | Crocodylus niloticus | Crocodilians, pt.1 | Apr 1, 2022 |
| Nile crocodile | Crocodylus niloticus | Crocodilians, pt.2 | Apr 8, 2022 |
| North American beaver | Castor canadensis | Rodents | Apr 26, 2024 |
| Northern black widow | Lactrodectus variolus | Creepy Critters | Oct 21, 2022 |
| Northern cardinal | Cardinalis cardinalis | Backyard Birds | Oct 16, 2020 |
| Northern cardinal | Cardinalis cardinalis | Backyard Birds | Feb 5, 2021 |
| Northern cardinal | Cardinalis cardinalis | Backyard Sounds | Jun 24, 2022 |
| Northern cardinal | Cardinalis cardinalis | Illinois State Symbols, pt.2 | Sep 2, 2022 |
| Northern cardinal | Cardinalis cardinalis | Greene Valley Trail | Jul 11, 2025 |
| Northern cottonmouth | Agkistrodon piscivorus | Venomous Reptiles Of Illinois | Jul 25, 2025 |
| Northern flicker | Colaptes auratus | Woodpeckers | Jul 31, 2020 |
| Northern flicker | Colaptes auratus | Why Do Woodpeckers Peck Wood? | Dec 2, 2022 |
| Northern goshawk | Accipiter gentilis | Hawks | Aug 28, 2020 |
| Northern goshawk | Accipiter gentilis | Illinois Hawks | Oct 22, 2021 |
| Northern harrier | Circus hudsonius | Hawks | Aug 28, 2020 |
| Northern harrier | Circus hudsonius | Midwestern Prairie | Nov 10, 2023 |
| Northern leopard frog | Lithobates pipiens | Turnover | Mar 5, 2021 |
| Northern leopard frog | Lithobates pipiens | Sounds of Spring | May 9, 2025 |
| Northern long-eared bat | Myotis septentrionalis | Bats | May 8, 2020 |
| Northern parula | Setophaga americana | Sounds of Spring | May 9, 2025 |
| Northern pintail | Anas acuta | Bird Song | Feb 28, 2025 |
| Northern red oak tree | Quercus rubra | Tree Buds | Feb 25, 2022 |
| Northen red oak tree | Quercus rubra | Oak-hickory Forest | Jul 14, 2023 |
| Northern red oak tree | Quercus rubra | Oak Tree Habitat, pt.1 | Jun 28, 2024 |
| Northern red oak tree | Quercus rubra | Greene Valley Trail | Jul 11, 2025 |
| Northern saw-whet owl | Aegolius acadicus | Illinois Owls p.2 | Dec 27, 2024 |
| Northern sea oats | Chasmanthium latifolium | Autumn Grass | Sep 17, 2021 |
| Northern short-tailed shrew | Blarina brevicauda | Oh To Be So Shrew-d | Jun 4, 2021 |
| Northern short-tailed shrew | Blarina brevicauda | Greene Valley Trail | Jul 11, 2025 |
| Northern waterthrush | Parkesia noveboracensis | Sounds of Spring | May 9, 2025 |
| Northern slimy salamander | Plethodon glutinosus glutinosus | Salamanders | Feb 14, 2025 |
| Northern widow | Latrodectus variolus | Spiders | Oct 30, 2020 |
| Northern zig-zag salamander | Plethodon dorsalis | Salamanders | Feb 14, 2025 |
| Olive ridley sea turtle | Lepidochelys olivacea | Sea Turtles | Dec 8, 2023 |
| Orange-peel fungus | Aleuria aurantia | Forest Litter | Sep 16, 2022 |
| Ord’s kangaroo rat | Dipodomys ordii | Desert Habitats, pt.3 | Nov 18, 2022 |
| Owl butterfly | Caligo eurilochus | Butterfly Defense | Jul 29, 2022 |
| Owl butterfly | Caligo eurilochus | Butterflies | Sep 27, 2024 |
| Pacific aster | Symphyotrichum chilense | American Asters | Oct 10, 2025 |
| Painted turtle | Chrysemys picta | Turnover | Mar 5, 2021 |
| Painted turtle | Chrysemys picta | Illinois State Symbols, pt.2 | Sep 2, 2022 |
| Pale purple coneflower | Echinacea pallida | Summer Pollinator Bloom | Aug 7, 2020 |
| Pale purple coneflower | Echinacea pallida | Coneflower | Jul 22, 2022 |
| Pale purple coneflower | Echinacea pallida | Butterflies & Flowers | Aug 5, 2022 |
| Pale-throated sloth | Bradypus tridactylus | Sloths | Dec 23, 2022 |
| Palm warbler | Setophaga palmarum | Wood Warblers | Apr 22, 2022 |
| Palm warbler | Setophaga palmarum | Sounds of Spring | May 9, 2025 |
| Pangolin | Family: Manidae | Fancy Hair | Mar 28, 2025 |
| Panicled aster | Symphyotrichum lanceolatum | Asters | Oct 15, 2021 |
| Paper birch | Betula papyrifera | Bark, pt.2 | Jan 28, 2022 |
| Passenger pigeon | Ectopistes migratorius | Extinct & Endangered | Feb 9, 2024 |
| Pearl crescent butterfly | Phyciodes tharos | Pollinator Garden | May 29, 2020 |
| Pearl crescent butterfly | Phyciodes tharos | Summer Pollinator Bloom | Aug 7, 2020 |
| Peck’s skipper | Polites peckius | American Asters | Oct 10, 2025 |
| Penicillin | Penicillium rubens | Illinois State Symbols, pt.1 | Aug 26, 2022 |
| Pennsylvania firefly | Photuris pennsylvanica | Fireflies | Jul 16, 2021 |
| Peregrine falcon | Falco peregrinus | Illinois Owls p.1 | Dec 13, 2024 |
| Piano key butterfly | Heliconius melpomene | Butterflies | Sep 27, 2024 |
| Pied-billed grebe | Podilymbus podiceps | Bird Song | Feb 28, 2025 |
| Pignut hickory | Carya glabra | Bark, pt.1 | Jan 21, 2022 |
| Pileated woodpecker | Dryocopus pileatus | Woodpeckers | Jul 31, 2020 |
| Pileated woodpecker | Dryocopus pileatus | Bark, pt.3 | Feb 4, 2022 |
| Pileated woodpecker | Dryocopus pileatus | Mushrooms | May 6, 2022 |
| Pileated woodpecker | Dryocopus pileatus | Why Do Woodpeckers Peck Wood? | Dec 2, 2022 |
| Pileated woodpecker | Dryocopus pileatus | Oak Tree Habitat, pt.2 | Jul 12, 2024 |
| Pin oak tree | Quercus palustris | Bark, pt.1 | Jan 21, 2022 |
| Pine siskin | Spinus pinus | Irruptions | Dec 18, 2020 |
| Pipevine swallowtail butterfly | Battus philenor | Summer Pollinator Bloom | Aug 7, 2020 |
| Pitch pine tree | Pinus rigida | Bark, pt.2 | Jan 28, 2022 |
| Plains garter snake | Thamnophis radix | Garter Snakes | Apr 17, 2020 |
| Plains garter snake | Thamnophis radix | Snake Monitoring | Jun 19, 2020 |
| Plains garter snake | Thamnophis radix | A Spring Walk | May 27, 2022 |
| Poison hemlock | Conium maculatum | Dangerous Plants | Aug 13, 2021 |
| Poison ivy | Toxicodendron radicans | The Itch! | Aug 21, 2020 |
| Polar bear | Ursus maritimus | Arctic Adaptations | Dec 9, 2022 |
| Polar bear | Ursus maritimus | Bear bones | Jan 10, 2025 |
| Polar bear | Ursus matirimus | White, Yellow, Green? | Jul 13, 2025 |
| Polyphemus moth caterpillar | Antheraea polyphemus | Oak Tree Habitat, pt.3 | Jul 26, 2024 |
| Poppy seed | Papaver paeoniflorum | Seeds | Oct 1, 2021 |
| Porcupine | Old world family: Hystricidae New world family: Erethizontidae | Fancy Hair | Mar 28, 2025 |
| Prairie dock | Silphium terebinthinaceum | Silphium | Sep 3, 2021 |
| Prairie dock | Silphium terebinthinaceum | Midwestern Prairie | Nov 10, 2023 |
| Prairie dropseed | Sporobolis heterolepis | Autumn Grass | Sep 17, 2021 |
| Prairie dropseed | Sporobolis heterolepis | Autumn Seed Collecting | Sep 9, 2022 |
| Prairie kingsnake | Lampropeltis calligaster | Midwestern Prairie | Nov 10, 2023 |
| Prairie trillium | Trillium recurvatum | Trillium | May 14, 2021 |
| Prairie trillium | Trillium recurvatum | Natives In Bloom | Apr 25, 2025 |
| Prairie trout lily | Eurythronium albidum mesochoreum | Wildflowers, pt. 1 | Apr 23, 2021 |
| Prickly pear cactus | Opuntia basilaris | Desert Habitats, pt.2 | Nov 11, 2022 |
| Proboscis monkey | Nasalis larvatus | Extinct & Endangered pt.2 | Feb 23, 2024 |
| Pronghorn | Antilocapra americana | Pronghorns | Dec 17, 2021 |
| Puffball | Calvatia gigantia | Mushrooms | May 6, 2022 |
| Puffball | Calvatia gigantia | Forest Litter | Sep 16, 2022 |
| Purple coneflower | Echinacea purpurea | Summer Pollinator Bloom | Aug 7, 2020 |
| Purple coneflower | Echinacea purpurea | Coneflower | Jul 22, 2022 |
| Purple coneflower | Echinacea purpurea | Butterflies & Flowers | Aug 5, 2022 |
| Purple coneflower | Echinacea purpurea | Autumn Seed Collecting | Sep 9, 2022 |
| Purple martin | Progne subis | Spring Migration | Feb 11, 2022 |
| Pygmy nuthatch | Sitta pygmaea | Nuthatches | Mar 17, 2023 |
| Pygmy shrew | Sorex hoyi | Oh To Be So Shrew-d | Jun 4, 2021 |
| Pygmy three-toed sloth | Bradypus pygmaeus | Sloths | Dec 23, 2022 |
| Quaking aspen tree | Populus tremuloides | Bark, pt.2 | Jan 28, 2022 |
| Queen Anne’s lace | Daucus carota carota | Butterflies & Flowers | Aug 5, 2022 |
| Question mark butterfly | Polygonia interrogationis | Butterflies & Flowers | Aug 5, 2022 |
| Raccoon | Procyon lotor | Urban Wild | Sep 18, 2020 |
| Raccoon | Procyon lotor | Mushrooms | May 6, 2022 |
| Rattlesnake master | Eryngium yuccifolium | Midwestern Prairie | Nov 10, 2023 |
| Red admiral butterfly | Vanessa atalanta | Pollinator Garden | May 29, 2020 |
| Red admiral butterfly | Vanessa atalanta | Summer Pollinator Bloom | Aug 7, 2020 |
| Red admiral butterfly | Vanessa atalanta | Butterfly Defense | Jul 29, 2022 |
| Red admiral butterfly | Vanessa atalanta | Butterflies & Flowers | Aug 5, 2022 |
| Red-backed salamander | Plethodon cinereus cinereus | Salamanders | Feb 14, 2025 |
| Red carpenter ant | Camponotus ferrugineus | Bark, pt.3 | Feb 4, 2022 |
| Red carpenter ant | Camponotus ferrugineus | Mushrooms | May 6, 2022 |
| Red fox | Vulpes vulpes | Urban Wild | Sep 18, 2020 |
| Red maple tree | Acer rubrum | Sap & Syrup | Jan 29, 2021 |
| Red maple tree | Acer rubrum | Maple Trees | Apr 7, 2023 |
| Red maple tree | Acer rubrum | Oak-hickory Forest | Jul 14, 2023 |
| Red Squirrel | Sciurus vulgaris | Squirrels | Nov 6, 2020 |
| Red squirrel | Sciurus vulgaris | Oak Tree Habitat, pt.2 | Jul 12, 2024 |
| Red velvet soil mite | Trombidium spp. | Forest Litter, Hand Lens Views | Sep 30, 2022 |
| Red-bellied woodpecker | Melanerpes carolinus | Woodpeckers | Jul 31, 2020 |
| Red-bellied woodpecker | Melanerpes carolinus | Backyard Birds | Oct 16, 2020 |
| Red-bellied woodpecker | Melanerpes carolinus | Why Do Woodpeckers Peck Wood? | Dec 2, 2022 |
| Red-breasted nuthatch | Sitta canadensis | Irruptions | Dec 18, 2020 |
| Red-breasted nuthatch | Sitta canadensis | Why Do Woodpeckers Peck Wood? | Dec 2, 2022 |
| Red-breasted nuthatch | Sitta canadensis | Nuthatches | Mar 17, 2023 |
| Redhead duck | Aythya americana | Spring Migration | Feb 11, 2022 |
| Red-headed woodpecker | Melanerpes erythrocephalus | Woodpeckers | Jul 31, 2020 |
| Red-legged grasshopper | Melanoplus femurrubrum | Grasshoppers | Jul 23, 2021 |
| Red-shouldered hawk | Buteo lineatus | Hawks | Aug 28, 2020 |
| Red-shouldered hawk | Buteo lineatus | Illinois Hawks | Oct 22, 2021 |
| Red-shouldered hawk | Buteo lineatus | Snake Defense | Dec 30, 2022 |
| Red squirrel | Tamiasciurus hudsonicus | Squirrels of Illinois | Aug 8, 2025 |
| Red-tailed hawk | Buteo jamaicensis | Hawks | Aug 28, 2020 |
| Red-tailed hawk | Buteo jamaicensis | Backyard Birds | Feb 5, 2021 |
| Red-tailed hawk | Buteo jamaicensis | Illinois Hawks | Oct 22, 2021 |
| Red-tailed hawk | Buteo jamaicensis | Illinois Owls p.1 | Dec 13, 2024 |
| Red-winged blackbird | Agelaius phoeniceus | Red winged Blackbird | Mar 26, 2021 |
| Red-winged blackbird | Agelaius phoeniceus | Cattails | Jul 2, 2021 |
| Red-winged blackbird | Agelaius phoeniceus | Spring Migration | Feb 11, 2022 |
| Red-winged blackbird | Agelaius phoeniceus | Red winged Blackbird | Mar 11, 2022 |
| Red-winged blackbird | Agelaius phoeniceus | Backyard Sounds | Jun 24, 2022 |
| Red-winged blackbird | Agelaius phoeniceus | Sounds of Spring | May 9, 2025 |
| Red-winged blackbird | Agelaius phoeniceus | Greene Valley Trail | Jul 11, 2025 |
| Reed canary grass | Phalaris arundinacea | Spring Wetland Vegetation | Apr 29, 2022 |
| Reindeer; Caribou | Rangifer tarandus | Antlers & Horns | Aug 12, 2022 |
| Rhinoceros auklet | Cerorhina monocerata | Puffins | Sep 22, 2023 |
| Rice paper butterfly | Idea leuconoe | Butterflies | Sep 27, 2024 |
| Riffle beetle | Elmidae sp | Aquatic Insects | Feb 24, 2023 |
| River birch tree | Betula nigra | Bark, pt.1 | Jan 21, 2022 |
| Rivoli’s hummingbird | Eugenes fulgens | Hummingbirds | Aug 23, 2024 |
| Rock candy lichen | Icmadophila ericetorum | Lichens | Jan 14, 2022 |
| Rose-of-sharon | Hibiscus syriacus | Hummingbirds | May 15, 2020 |
| Rosinweed | Silphium integrefolium | Silphium | Sep 3, 2021 |
| Rough coneflower | Rudbeckia grandiflora | Coneflower | Jul 22, 2022 |
| Rough-legged hawk | Buteo lagopus | Hawks | Aug 28, 2020 |
| Rough-legged hawk | Buteo lagopus | Illinois Hawks | Oct 22, 2021 |
| Round tailed ground squirrel | Xerospermophilus tereticaudus | Desert Habitats, pt.3 | Nov 18, 2022 |
| Round-lobed hepatica | Hepatica americana | Wildflowers, pt. 1 | Apr 23, 2021 |
| Ruby-crowned kinglet | Regulus calendula | Bird Song | Feb 28, 2025 |
| Ruby-throated hummingbird | Archilochus colubris | Hummingbirds | May 15, 2020 |
| Ruby-throated hummingbird | Archilochus colubris | Summer Pollinator Bloom | Aug 7, 2020 |
| Ruby-throated hummingbird | Archilochus colubris | Neighborhood Nests | May 28, 2021 |
| Ruby-throated hummingbird | Archilochus colubris | Migration | Oct 28, 2022 |
| Ruby-throated hummingbird | Archilobus colubris | Bird Beaks | Nov 24, 2023 |
| Ruby-throated hummingbird | Archilobus colubris | Hummingbirds | Aug 23, 2024 |
| Rufous hummingbird | Selasphorus rufus | Hummingbirds | Aug 23, 2024 |
| Rush aster | Symphyotrichum boreale | Asters | Oct 15, 2021 |
| Saguaro cactus | Carnegiea gigantea | Desert Habitats, pt.2 | Nov 11, 2022 |
| Saltwater crocodile | Crocodylus porosus | Crocodilians, pt.1 | Apr 1, 2022 |
| Saltwater crocodile | Crocodylus porosus | Crocodilians, pt.2 | Apr 8, 2022 |
| Sandhill crane | Antigone canadensis | Sandhill Cranes | Mar 19, 2021 |
| Sandhill crane | Antigone canadensis | Spring Migration | Feb 11, 2022 |
| Sandhill crane | Grus canadensis | Bird Song | Feb 28, 2025 |
| Sara butterfly | Heliconius sara | Butterflies | Sep 27, 2024 |
| Sawfly | Symphyta sp | Backyard Sounds | Jun 24, 2022 |
| Scarlet elf cup | Sarcoscypha coccinea | Mushrooms | May 6, 2022 |
| Scarlet kingsnake | Lampropeltis elapsoides | Snake Defense | Dec 30, 2022 |
| Scarlet salvia | Salvia splendens | Hummingbirds | May 15, 2020 |
| Scarlet swallowtail butterfly | Papilio rumanzovia | Butterflies | Sep 27, 2024 |
| Sea urchin | Holectypus planatus | Fossils of Illinois | Jan 12, 2024 |
| Sedge wren | Cistothorus platensis | Midwestern Prairie | Nov 10, 2023 |
| Sedum | Sedum spp. | American Asters | Oct 10, 2025 |
| Sei whale | Balaenoptera borealis | Sei Whale | Feb 17, 2023 |
| Sei whale | Balaenoptera borealis | Baleen Whales | Oct 25, 2024 |
| Serviceberry tree | Amelanchier arborea | Tree Buds | Feb 25, 2022 |
| Serviceberry tree | Amelanchier arborea | Backyard Sounds | Jun 24, 2022 |
| Serviceberry tree | Amalanchier arborea | Natives In Bloom | Apr 25, 2025 |
| Shagbark hickory tree | Carya ovata | Bark, pt.2 | Jan 28, 2022 |
| Shagbark hickory tree | Carya ovata | Oak-hickory Forest | Jul 14, 2023 |
| Sharp-lobed hepatica | Hepatica acutiloba | Wildflowers, pt. 1 | Apr 23, 2021 |
| Sharp-lobed hepatica | Hepatica acutiloba | Natives In Bloom | Apr 25, 2025 |
| Sharp-shinned hawk | Accipiter striatus | Hawks | Aug 28, 2020 |
| Sharp-shinned hawk | Accipiter striatus | Backyard Birds | Feb 5, 2021 |
| Sharp-shinned hawk | Accipiter striatus | Illinois Hawks | Oct 22, 2021 |
| Shining aster | Symphyotrichum firmum | Asters | Oct 15, 2021 |
| Shooting star | Dodecatheon meadia | Spring Wildflowers | Apr 10, 2020 |
| Shooting star | Dodecatheon meadia | Autumn Seed Collecting | Sep 9, 2022 |
| Shooting star | Dodecatheon meadia | Natives In Bloom | Apr 25, 2025 |
| Short’s aster | Symphyotrichum shortii | Asters | Oct 15, 2021 |
| Short’s aster | Symphyotrichum shortii | Butterflies & Flowers | Aug 5, 2022 |
| Short-eared owl | Asio flammeus | Illinois Owls p.2 | Dec 27, 2024 |
| Short-tailed weasel | Mustela erminea | Boreal Forest in Winter | Jan 13, 2023 |
| Short-tailed weasel | Mustela erminea | Weasels | Mar 10, 2023 |
| Showy milkweed | Asclepias speciosa | Herbaria | Oct 14, 2022 |
| Silver maple tree | Acer saccharinum | Winter Tree ID, Pt.2 | Feb 19, 2021 |
| Silver maple tree | Acer saccharinum | Spring Wetland Vegetation | Apr 29, 2022 |
| Silver maple tree | Acer saccharinum | Maple Trees | Apr 7, 2023 |
| Silver orb spider | Leucauge granulata | Orb Weavers | Nov 4, 2021 |
| Silver-haired bat | Lasionycteris noctivagans | Bats | May 8, 2020 |
| Skunk cabbage | Symplocarpus foetidus | Early Spring Blooms | Mar 25, 2022 |
| Small-mouthed salamander | Ambystoma texanum | Salamanders | Feb 14, 2025 |
| Smooth blue aster | Symphyotrichum laeve | American Asters | Oct 10, 2025 |
| Smooth solomon’s seal | Polygonatum biflorum | Autumn Seed Collecting | Sep 9, 2022 |
| Snow leopard | Panthera uncia | Snow Leopards | Aug 19, 2022 |
| Snow leopard | Panthera uncia | Pamir Wildlife | Mar 14, 2025 |
| Snowshoe hare | Lepus americana | Boreal Forest in Winter | Jan 13, 2023 |
| Snowy owl | Bubo scandiacus | Spring Migration | Feb 11, 2022 |
| Snowy owl | Bubo scandiacus | Illinois Owls p.1 | Dec 13, 2024 |
| Snowy owl | Bubo scandiacus | Illinois Owls p.2 | Dec 27, 2024 |
| Snowy owl | Bubo scandiacus | Great Horned Owl | Apr 11, 2025 |
| Song sparrow | Melospiza melodia | Greene Valley Trail | Jul 11, 2025 |
| Somali ostrich | Struthio molybdophanes | Ostrich | Oct 11, 2024 |
| Sonoran mud turtle | Kinosternon sonoriense | Desert Habitats, pt.3 | Nov 18, 2022 |
| Southern flying squirrel | Glaucomys volans | Squirrels | Nov 6, 2020 |
| Southern flying squirrel | Glaucomys volans | Squirrels of Illinois | Aug 8, 2025 |
| Southern live oak tree | Quercus virginiana | Bark, pt.3 | Feb 4, 2022 |
| Southern three-banded armadillo | Tolypeutes matacus | Fancy Hair | Mar 28, 2025 |
| Southern two-lined salamander | Eurycea cirrigera | Salamanders | Feb 14, 2025 |
| Spicebush swallowtail butterfly | Papilio troilus | Butterflies & Flowers | Aug 5, 2022 |
| Spatterdock | Nuphar advena | Duck Potato Salad | Jan 20, 2023 |
| Speckled wood caterpillar | Pararge aegeria | Oak Tree Habitat, pt.3 | Jul 26, 2024 |
| Spider | Philodromus Praedatus | Oak Tree Habitat, pt.3 | Jul 26, 2024 |
| Spot-tailed dasher | Micrathyria aequalis | Spring Wetland Vegetation | Apr 29, 2022 |
| Spotted salamander | Ambystoma maculatum | Salamanders | Mar 4, 2022 |
| Spotted salamander | Ambystoma maculatum | Salamanders | Feb 14, 2025 |
| Spotted thyris moth | Thyris maculata | Pollinator Garden | May 29, 2020 |
| Spring beauty | Claytonia virginica | Wildflowers, pt. 1 | Apr 23, 2021 |
| Spring beauty | Claytonia virginica | Natives In Bloom | Apr 25, 2025 |
| Spring peeper | Pseudacris crucifer | Frog Calling | Mar 24, 2023 |
| Spring peeper | Pseudacris crucifer | Spring Peepers | Apr 3, 2020 |
| Spring peeper | Pseudacris crucifer | Sounds of Spring | May 9, 2025 |
| Springtail | Isotoma spp. | Forest Litter, Hand Lens Views | Sep 30, 2022 |
| Spruce | Picea spp | Boreal Forest in Winter | Jan 13, 2023 |
| Spruce grouse | Canachites canadensis | Boreal Forest in Winter | Jan 13, 2023 |
| Spur-throated grasshopper | Melanoplus ponderosus | Grasshoppers | Jul 23, 2021 |
| Squash | Cucurbita sp | Pumpkins | Sep 25, 2020 |
| Squash bee | Peponapis pruinosa | Pumpkins | Sep 25, 2020 |
| Squirrel corn | Dicentra canadensis | Early Spring Blooms | Mar 25, 2022 |
| Staghorn fern | Platycerium sp. | Ferns | May 26, 2023 |
| Star rosette lichen | Physcia stellaris | Lichens | Jan 14, 2022 |
| Stinkhorn mushroom | Phallaceae | Forest Litter | Sep 16, 2022 |
| Striped skunk | Mephitis mephitis | Urban Wild | Sep 18, 2020 |
| Striped skunk | Mephitis mephitis | Snake Defense | Dec 30, 2022 |
| Sugar maple tree | Acer saccharum | Sap & Syrup | Jan 29, 2021 |
| Sugar maple tree | Acer saccharum | Maple Trees | Apr 7, 2023 |
| Sugar maple tree | Acer saccharum | Oak-hickory Forest | Jul 14, 2023 |
| Sumac | Rhus sp | Greene Valley Trail | Jul 11, 2025 |
| Summer tanager | Piranga rubra | Bird Song | Feb 28, 2025 |
| Swainson’s hawk | Buteo swainsoni | Illinois Hawks | Oct 22, 2021 |
| Swamp milkweed | Asclepias incarnata | Common Milkweed Pollinators | Jul 8, 2022 |
| Switchgrass | Panicum virgatum | Autumn Grass | Sep 17, 2021 |
| Tarantula | Aphonopelma sp | Desert Habitats, pt.3 | Nov 18, 2022 |
| Tarantula hawk | Pepsis sp | Desert Habitats, pt.3 | Nov 18, 2022 |
| Texas longhorn cattle | Antlers & Horns | Aug 12, 2022 | |
| Texas red oak tree | Quercus buckleyi | Oak Tree Habitat, pt.1 | Jun 28, 2024 |
| Thirteen-lined ground squirrel | Ictidomys tridecemlineatus | Chipminks | Jun 18, 2021 |
| Thirteen-lined ground squirrel | Ictidomys tridecemlineatus | Midwestern Prairie | Nov 10, 2023 |
| Three-toed salamander | Amphiuma tridactylum | Salamanders | Feb 14, 2025 |
| Ticktrefoil seed | Desmodium sp | Seeds | Oct 1, 2021 |
| Tiger moth | Arctiinae sp. | Greene Valley Trail | Jul 11, 2025 |
| Tiger salamander | Ambystoma tigrinum | Salamanders | Mar 4, 2022 |
| Tiger salamander | Ambystoma tigrinum | Salamanders | Feb 14, 2025 |
| Timber rattlesnake | Crotalus horridus | Snake Defense | Dec 30, 2022 |
| Timber rattlesnake | Crotalus horridus | Venomous Reptiles Of Illinois | Jul 25, 2025 |
| Toad trillium | Trillium sessile | Trillium | May 14, 2021 |
| Tracy’s sundew | Drosera tracyi | Carnivorous Plants | Sep 8, 2023 |
| Tree cricket | Oecanthinae sp | Night Buzzers | Sep 6, 2023 |
| Trilobyte | Armonia elongata | Fossils of Illinois | Jan 12, 2024 |
| Trilobyte | Flexicalymene retorsa | Fossils of Illinois | Jan 13, 2024 |
| Trilobyte | Phacops rana | Fossils of Illinois | Jan 14, 2024 |
| Tripod fish | Bathypterois grallator | The Ocean Deep | Apr 14, 2023 |
| Trumpet vine | Campsis radicans | Hummingbirds | May 15, 2020 |
| Tufted puffin | Fratercula cirrhata | Puffins | Sep 22, 2023 |
| Tully Monster | Tullimonstrum gregarium | Fossils of Illinois – part 2 | Jan 26, 2024 |
| Tully Monster | Tullimonstrum gregarium | Illinois State Symbols, pt.1 | Aug 26, 2022 |
| Turkey | Meleagris gallopavo | Turkeys | Nov 27, 2020 |
| Turkey vulture | Cathartes aura | Illinois Owls p.1 | Dec 13, 2024 |
| Two-spotted bumblebee | Bombus bimaculatus | Carnivorous Plants | Sep 8, 2023 |
| Two-striped grasshopper | Melanoplus bivittatus | Grasshoppers | Jul 23, 2021 |
| Upland sandpiper | Bartramia longicauda | Bird Song | Feb 28, 2025 |
| Venus flytrap | Dionaea muscipula | Carnivorous Plants | Sep 8, 2023 |
| Viceroy butterfly | Limenitis archippus | Butterfly Defense | Jul 29, 2022 |
| Violet | Viola spp | Illinois State Symbols, pt.1 | Aug 26, 2022 |
| Violet-crowned hummingbird | Amazilia violiceps | Hummingbirds | Aug 23, 2024 |
| Virginia bluebells | Mertensia virginica | Spring Wildflowers | Apr 10, 2020 |
| Virginia bluebells | Mertensia virginica | Natives In Bloom | Apr 25, 2025 |
| Virginia creeper | Parthenocissus quinquefolia | Greene Valley Trail | Jul 11, 2025 |
| Virginia opossum | Didelphis virginiana | Opossum | Aug 20, 2021 |
| Virginia waterleaf | Hydrophyllum virginianum | Pollinator Garden | May 29, 2020 |
| Walking fern | Asplenium rhizophyllum | Fern Fun | Jun 25, 2021 |
| Walking fern | Asplenium rhizophyllum | Ferns | May 26, 2023 |
| Water marigold | Caltha palustris | Duck Potato Salad | Jan 20, 2023 |
| Water penny | Psephenidae | Aquatic Insects | Feb 24, 2023 |
| Water skater | Gerridae sp | Lakes & Ponds | May 20, 2022 |
| Water willow tree | Justicia americana | Spring Wetland Vegetation | Apr 29, 2022 |
| Water-cup mushroom | Pezizales spp. | Forest Litter | Sep 16, 2022 |
| Western coral snake | Micruroides euryxanthus | Desert Habitats, pt.3 | Nov 18, 2022 |
| Western lesser siren | Siren intermedia nettingi | Salamanders | Feb 14, 2025 |
| White ash tree | Fraxinus americana | Ash Trees | Aug 11, 2023 |
| White cabbage butterfly | Pieris rapae | Greene Valley Trail | Jul 11, 2025 |
| White clover | Trifolium repens | Butterflies & Flowers | Aug 5, 2022 |
| White-eared hummingbird | Basilinna leucatis | Hummingbirds | Aug 23, 2024 |
| White oak tree | Quercus alba | Winter Tree ID, Pt.2 | Feb 19, 2021 |
| White oak tree | Quercus alba | Acorns | Sep 24, 2021 |
| White oak tree | Quercus alba | Bark, pt.2 | Jan 28, 2022 |
| White oak tree | Quercus alba | Illinois State Symbols, pt.1 | Aug 26, 2022 |
| White oak tree | Quercus alba | Oak-hickory Forest | Jul 14, 2023 |
| White-tailed deer | Odocoileus virginianus | Greene Valley Trail | Jul 11, 2025 |
| White trout lily | Eurythronium albidum | Wildflowers, pt. 1 | Apr 23, 2021 |
| White trout lily | Eurythronium albidum | A Spring Walk | May 27, 2022 |
| White-breasted nuthatch | Sitta carolinensis | Backyard Birds | Oct 16, 2020 |
| White-breasted nuthatch | Sitta carolinensis | Happy Thanksgiving 2022 | Nov 25, 2022 |
| White-breasted nuthatch | Sitta carolinensis | Why Do Woodpeckers Peck Wood? | Dec 2, 2022 |
| White-breasted nuthatch | Sitta carolinensis | Nuthatches | Mar 17, 2023 |
| White-topped pitcher plant | Sarracenia leucophylla | Carnivorous Plants | Sep 8, 2023 |
| White-tailed deer | Odocoileus virginianus | Antlers & Horns | Aug 12, 2022 |
| White-tailed deer | Odocoileus virginianus | Illinois State Symbols, pt.2 | Sep 2, 2022 |
| White-throated snowdrops; Common snowdrops | Galanthus nivalis | Early Spring Blooms | Mar 25, 2022 |
| White trout lily | Erythronium albidum | Natives In Bloom | Apr 25, 2025 |
| Whooping Crane | Grus americana | Extinct & Endangered pt.2 | Feb 23, 2024 |
| Wild bergamot | Monarda fistulosa | Greene Valley Trail | Jul 11, 2025 |
| Wild celery | Vallisneria americana | Duck Potato Salad | Jan 20, 2023 |
| Wild columbine | Aquilegia canadensis | Autumn Seed Collecting | Sep 9, 2022 |
| Wild Parsnip | Pastinaca sativa | The Itch! | Aug 21, 2020 |
| Wild yak | Bos mutus | Pamir Wildlife | Mar 14, 2025 |
| Willow tree | Salix spp | Boreal Forest in Winter | Jan 13, 2023 |
| Willow ptarmigan | Lagopus lagopus | Boreal Forest in Winter | Jan 13, 2023 |
| Wolf spider | Rabidosa spp. | Forest Litter, Critters To See | Sep 23, 2022 |
| Wolverine | Gulo gulo | Snake Defense | Dec 30, 2022 |
| Wood duck | Aix sponsa | A Spring Walk | May 27, 2022 |
| Wood frog | Lithobates sylvaticus | Hibernation | Oct 23, 2020 |
| Wood mouse | Apodemus sylvaticus | Oak Tree Habitat, pt.2 | Jul 12, 2024 |
| Wood tick; American dog tick | Dermacentor variabilis | The Itch! | Aug 21, 2020 |
| Woodchuck; Groundhog | Marmota monax | Hibernation | Oct 23, 2020 |
| Woodchuck; Groundhog | Marmota monax | Chipmunks | Jun 18, 2021 |
| Woodland phlox | Phlox divaricata | Pollinator Garden | May 29, 2020 |
| Wrinkled crust lichen | Phlebia radiata | Lichens | Jan 14, 2022 |
| Yellow-bellied sapsucker | Sphyrapicus varius | Bird Song | Feb 28, 2025 |
| Yellow coneflower; gray-headed coneflower | Ratabida pinnata | Summer Pollinator Bloom | Aug 7, 2020 |
| Yellow coneflower; gray-headed coneflower | Ratabida pinnata | Coneflower | Jul 22, 2022 |
| Yellow coneflower; gray-headed coneflower | Ratabida pinnata | Butterflies & Flowers | Aug 5, 2022 |
| Yellow coneflower; gray-headed coneflower | Ratabida pinnata | Autumn Seed Collecting | Sep 9, 2022 |
| Yellow morel | Morchella esculenta | Mushrooms | May 6, 2022 |
| Yellow trout lily | Eurythronium americanum | Wildflowers, pt. 1 | Apr 23, 2021 |
| Yellow warbler | Setophaga petechia | Wood Warblers | Apr 22, 2022 |
| Yellow-bellied sapsucker | Sphyrapicus varius | Woodpeckers | Jul 31, 2020 |
| Yellow-bellied sapsucker | Sphyrapicus varius | Why Do Woodpeckers Peck Wood? | Dec 2, 2022 |
| Yellow-headed blackbird | Xanthocephalus xanthocephalus | Cattails | Jul 2, 2021 |
| Yellow-rumped warbler | Setophaga coronata | Wood Warblers | Apr 22, 2022 |
| Yellow-rumped warbler | Setophaga coronata | Sounds of Spring | May 9, 2025 |
| Yucca | Yucca sp | Succulents | Jul 15, 2022 |
| Zebra longwing butterfly | Haliconius charitonia | Butterflies | Sep 27, 2024 |
| Zinnia | Zinnia sp | Hummingbirds | May 15, 2020 |
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