Wildlife of Boulder County

Boulder County is comprised of 740 square miles of land nestled along the front range of Colorado just 30 miles northwest of Denver. Its proximity to the mountains, diverse landscapes, and various designated open spaces make the county ideal for observing local and even migrating wildlife. ...more ↓

Sagebrush Vole ¹
Lemmiscus curtatus

Abert's Squirrel ²
Sciurus aberti

Fox Squirrel ³
Sciurus niger

Yellow-bellied Marmot ⁴
Marmota flaviventris

White-tailed Prairie Dog ⁵
Cynomys leucurus

Black-tailed Prairie Dog ⁶
Cynomys ludovicianus

Uinta Chipmunk ⁷
Tamias umbrinus

Least Chipmunk ⁸
Tamias minimus

Colorado Chipmunk ⁹
Tamias quadrivittatus

American Red Squirrel ¹⁰
Tamiasciurus hudsonicus

American Water Shrew ¹¹
Sorex palustris

Dwarf Shrew
Sorex nanus

American Pygmy Shrew ¹²
Sorex hoyi

Dusky Shrew ¹
Sorex monticolus

Merriam's Shrew ¹
Sorex merriami

North American Least Shrew ¹³
Cryptotis parva

Codling Moth ¹⁴
Cydia pomonella

Western Honey Bee ¹⁵
Apis mellifera

Western Tiger Swallowtail ¹⁶
Papilio rutulus

Western Black Widow ¹⁷
Latrodectus hesperus

Rainbow Trout ¹⁸
Oncorhynchus mykiss

Brown Trout ¹⁹
Salmo trutta

Polyphemus Moth ²⁰
Antheraea polyphemus

Widow Skimmer ²¹
Libellula luctuosa

Common Silverfish ²²
Lepisma saccharina

Asian Lady Beetle ²³
Harmonia axyridis

Painted Lady ²⁴
Vanessa cardui

Monarch ³
Danaus plexippus

Wheel Bug ²⁵
Arilus cristatus

Convergent Lady Beetle ²⁶
Hippodamia convergens

Red Admiral ²⁷
Vanessa atalanta

White-lined Sphinx ²⁸
Hyles lineata

Bluegill ²⁹
Lepomis macrochirus

Brook Trout ³⁰
Salvelinus fontinalis

Blinded Sphinx ³¹
Paonias excaecata

Halloween Pennant ³²
Celithemis eponina

Hoary Comma ³³
Polygonia gracilis

Gray Hairstreak ³⁴
Strymon melinus

Red-eared Slider ³⁵
Trachemys scripta elegans

Common Checkered-Skipper ³⁶
Pyrgus communis

Pallid-winged Grasshopper ³⁷
Trimerotropis pallidipennis

Greater Bee Fly ³⁸
Bombylius major

Seven-spotted Ladybird ²³
Coccinella septempunctata

American Rubyspot ³⁹
Hetaerina americana

Dainty Sulphur ²
Nathalis iole

Two-spotted Ladybug ⁴⁰
Adalia bipunctata

Northern Paper Wasp ⁴¹
Polistes fuscatus

Agile Long-horned Bee ⁴²
Melissodes agilis

Alfalfa Leafcutter Bee ⁴³
Megachile rotundata

Black Saddlebags ³⁹
Tramea lacerata

Bald-faced Hornet ⁴⁴
Dolichovespula maculata

Pearl Crescent ⁴⁵
Phyciodes tharos

Eastern Boxelder Bug ⁴⁶
Boisea trivittata

Big-eyed Toad Bug ⁴⁷
Gelastocoris oculatus

Rose Aphid ⁴⁸
Macrosiphum rosae

Virile Crayfish ⁴⁹
Orconectes virilis

Bold Jumper ⁵⁰
Phidippus audax

European Mantis ⁵¹
Mantis religiosa

European Carp ⁵²
Cyprinus carpio

Callippe Fritillary
Speyeria callippe

Spotted Cucumber Beetle ⁵³
Diabrotica undecimpunctata

Pale Swallowtail ⁵⁴
Papilio eurymedon

Large Milkweed Bug ²³
Oncopeltus fasciatus

Cabbage White ⁵⁵
Pieris rapae

Drone Fly ⁵⁶
Eristalis tenax

Western Tent Caterpillar Moth ⁵⁷
Malacosoma californicum

Common Pill-bug ⁵⁸
Armadillidium vulgare

Vivid Dancer ⁵⁹
Argia vivida

Masked Hunter ⁶⁰
Reduvius personatus

Satyr Comma ⁶¹
Polygonia satyrus

Harlequin Bug ⁶²
Murgantia histrionica

Silvery Blue ⁶³
Glaucopsyche lygdamus

Mourning Cloak ⁶⁴
Nymphalis antiopa

Four-spotted Skimmer ⁶⁵
Libellula quadrimaculata

Western Spotted Skunk
Spilogale gracilis

Brilliant Jumper ⁶⁶
Phidippus clarus

Johnson's Jumper ⁶⁷
Phidippus johnsoni

Dreamy Duskywing ⁶⁸
Erynnis icelus

Leonard's Skipper ⁶⁹
Hesperia leonardus

Tawny-edged Skipper ⁷⁰
Polites themistocles

Dun Skipper ³⁹
Euphyes vestris

Black Swallowtail ⁷¹
Papilio polyxenes

Clouded Sulphur ⁷²
Colias philodice

Orange Sulphur ⁷²
Colias eurytheme

Bronze Copper ⁷³
Lycaena hyllus

Aphrodite Fritillary ⁷⁴
Speyeria aphrodite

Viceroy ⁷⁵
Limenitis archippus

Green Sunfish ⁷⁶
Lepomis cyanellus

Western Mosquitofish ⁷⁷
Gambusia affinis

Checkered White ³²
Pontia protodice

Large Marble ⁷⁸
Euchloe ausonides

Edited by srupinsky, Melanie Hill, Deborah H Price, and Dave Sutherland, some rights reserved (CC BY-SA)

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Wildlife of Boulder County

Sagebrush Vole 1 Lemmiscus curtatus

Abert's Squirrel 2 Sciurus aberti

Fox Squirrel 3 Sciurus niger

Yellow-bellied Marmot 4 Marmota flaviventris

White-tailed Prairie Dog 5 Cynomys leucurus

Black-tailed Prairie Dog 6 Cynomys ludovicianus

Uinta Chipmunk 7 Tamias umbrinus

Least Chipmunk 8 Tamias minimus

Colorado Chipmunk 9 Tamias quadrivittatus

American Red Squirrel 10 Tamiasciurus hudsonicus

American Water Shrew 11 Sorex palustris

Dwarf Shrew Sorex nanus

American Pygmy Shrew 12 Sorex hoyi

Dusky Shrew 1 Sorex monticolus

Merriam's Shrew 1 Sorex merriami

North American Least Shrew 13 Cryptotis parva

Codling Moth 14 Cydia pomonella

Western Honey Bee 15 Apis mellifera

Western Tiger Swallowtail 16 Papilio rutulus

Western Black Widow 17 Latrodectus hesperus

Rainbow Trout 18 Oncorhynchus mykiss

Brown Trout 19 Salmo trutta

Polyphemus Moth 20 Antheraea polyphemus

Widow Skimmer 21 Libellula luctuosa

Common Silverfish 22 Lepisma saccharina

Asian Lady Beetle 23 Harmonia axyridis

Painted Lady 24 Vanessa cardui

Monarch 3 Danaus plexippus

Wheel Bug 25 Arilus cristatus

Convergent Lady Beetle 26 Hippodamia convergens

Red Admiral 27 Vanessa atalanta

White-lined Sphinx 28 Hyles lineata

Bluegill 29 Lepomis macrochirus

Brook Trout 30 Salvelinus fontinalis

Blinded Sphinx 31 Paonias excaecata

Halloween Pennant 32 Celithemis eponina

Hoary Comma 33 Polygonia gracilis

Gray Hairstreak 34 Strymon melinus

Red-eared Slider 35 Trachemys scripta elegans

Common Checkered-Skipper 36 Pyrgus communis

Pallid-winged Grasshopper 37 Trimerotropis pallidipennis

Greater Bee Fly 38 Bombylius major

Seven-spotted Ladybird 23 Coccinella septempunctata

American Rubyspot 39 Hetaerina americana

Dainty Sulphur 2 Nathalis iole

Two-spotted Ladybug 40 Adalia bipunctata

Northern Paper Wasp 41 Polistes fuscatus

Agile Long-horned Bee 42 Melissodes agilis

Alfalfa Leafcutter Bee 43 Megachile rotundata

Black Saddlebags 39 Tramea lacerata

Bald-faced Hornet 44 Dolichovespula maculata

Pearl Crescent 45 Phyciodes tharos

Eastern Boxelder Bug 46 Boisea trivittata

Big-eyed Toad Bug 47 Gelastocoris oculatus

Rose Aphid 48 Macrosiphum rosae

Virile Crayfish 49 Orconectes virilis

Bold Jumper 50 Phidippus audax

European Mantis 51 Mantis religiosa

European Carp 52 Cyprinus carpio

Callippe Fritillary Speyeria callippe

Spotted Cucumber Beetle 53 Diabrotica undecimpunctata

Pale Swallowtail 54 Papilio eurymedon

Large Milkweed Bug 23 Oncopeltus fasciatus

Cabbage White 55 Pieris rapae

Drone Fly 56 Eristalis tenax

Western Tent Caterpillar Moth 57 Malacosoma californicum

Common Pill-bug 58 Armadillidium vulgare

Vivid Dancer 59 Argia vivida

Masked Hunter 60 Reduvius personatus

Satyr Comma 61 Polygonia satyrus

Harlequin Bug 62 Murgantia histrionica

Silvery Blue 63 Glaucopsyche lygdamus

Mourning Cloak 64 Nymphalis antiopa

Four-spotted Skimmer 65 Libellula quadrimaculata

Western Spotted Skunk Spilogale gracilis

Brilliant Jumper 66 Phidippus clarus

Johnson's Jumper 67 Phidippus johnsoni

Dreamy Duskywing 68 Erynnis icelus

Leonard's Skipper 69 Hesperia leonardus