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

Fairy-slipper ¹⁵
Calypso bulbosa

Western Honey Bee ¹⁶
Apis mellifera

Western Tiger Swallowtail ¹⁷
Papilio rutulus

spreading dogbane ¹⁸
Apocynum androsaemifolium

Western Black Widow ¹⁹
Latrodectus hesperus

Shaggy Mane ²⁰
Coprinus comatus

bird's-foot trefoil ²¹
Lotus corniculatus

Rainbow Trout ²²
Oncorhynchus mykiss

Brown Trout ²³
Salmo trutta

common dandelion ²⁴
Taraxacum officinale

Wolf's Milk ²⁵
Lycogala epidendrum

common stork's-bill ²⁶
Erodium cicutarium

dame's-violet ²⁷
Hesperis matronalis

wild geranium ²⁸
Geranium maculatum

boxelder maple ²⁹
Acer negundo

common jewelweed ³⁰
Impatiens capensis

butterfly milkweed ³¹
Asclepias tuberosa

Polyphemus Moth ³²
Antheraea polyphemus

Widow Skimmer ³³
Libellula luctuosa

broadleaf arrowhead ³⁴
Sagittaria latifolia

Hound's-tongue ³⁵
Cynoglossum officinale

Cornflower ³⁶
Centaurea cyanus

common Douglas-fir ³⁷
Pseudotsuga menziesii

Common Silverfish ³⁸
Lepisma saccharina

ponderosa pine ³⁹
Pinus ponderosa

Asian Lady Beetle ¹⁸
Harmonia axyridis

Painted Lady ⁴⁰
Vanessa cardui

Catnip ⁴¹
Nepeta cataria

purple coneflower ⁴²
Echinacea purpurea

American Plum ⁴³
Prunus americana

Yellow Cosmos ⁴⁴
Cosmos sulphureus

Monarch ³
Danaus plexippus

bulrush ⁴⁵
Typha latifolia

Fly Agaric ⁴⁶
Amanita muscaria

lodgepole pine ⁴⁷
Pinus contorta

Wheel Bug ⁴⁸
Arilus cristatus

Convergent Lady Beetle ⁴⁹
Hippodamia convergens

Red Admiral ⁵⁰
Vanessa atalanta

White-lined Sphinx ⁵¹
Hyles lineata

spotted coralroot ⁵²
Corallorhiza maculata

Bluegill ⁵³
Lepomis macrochirus

Brook Trout ⁵⁴
Salvelinus fontinalis

common starlily ⁵⁵
Leucocrinum montanum

Blinded Sphinx ⁵⁶
Paonias excaecata

red baneberry ⁵⁵
Actaea rubra

paper birch ⁵⁷
Betula papyrifera

Halloween Pennant ⁵⁸
Celithemis eponina

Virginia creeper ⁵⁹
Parthenocissus quinquefolia

wild strawberry ⁶⁰
Fragaria vesca

Hoary Comma ⁶¹
Polygonia gracilis

Gray Hairstreak ⁶²
Strymon melinus

false Solomon's-seal ²
Maianthemum racemosum

Chinese lantern ²
Quincula lobata

Red-eared Slider ⁶³
Trachemys scripta elegans

Common Checkered-Skipper ⁶⁴
Pyrgus communis

Pallid-winged Grasshopper ⁶⁵
Trimerotropis pallidipennis

Greater Bee Fly ⁶⁶
Bombylius major

Seven-spotted Ladybird ¹⁸
Coccinella septempunctata

devil's beggarticks ⁶⁷
Bidens frondosa

American Rubyspot ⁶⁸
Hetaerina americana

Indian blanket ⁶⁹
Gaillardia pulchella

Dainty Sulphur ²
Nathalis iole

red clover ⁷⁰
Trifolium pratense

woodland pinedrops
Pterospora andromedea

eastern cottonwood ⁷¹
Populus deltoides

scarlet gilia ⁷²
Ipomopsis aggregata

Ipomopsis aggregata candida ⁷³

slendertube skyrocket ⁷⁴
Ipomopsis tenuituba

Two-spotted Ladybug ⁷⁵
Adalia bipunctata

common bracken ⁴⁰
Pteridium aquilinum

cock's-foot ⁷⁶
Dactylis glomerata

Northern Paper Wasp ⁷⁷
Polistes fuscatus

common selfheal ⁷⁵
Prunella vulgaris

Agile Long-horned Bee ⁷⁸
Melissodes agilis

Alfalfa Leafcutter Bee ⁷⁹
Megachile rotundata

common yarrow ⁸⁰
Achillea millefolium

Achillea millefolium millefolium

pearly everlasting ⁸¹
Anaphalis margaritacea

Black Saddlebags ⁶⁸
Tramea lacerata

Bald-faced Hornet ⁸²
Dolichovespula maculata

chicory ³⁵
Cichorium intybus

Pearl Crescent ⁸³
Phyciodes tharos

spear thistle ⁸⁴
Cirsium vulgare

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

Fairy-slipper 15 Calypso bulbosa

Western Honey Bee 16 Apis mellifera

Western Tiger Swallowtail 17 Papilio rutulus

spreading dogbane 18 Apocynum androsaemifolium

Western Black Widow 19 Latrodectus hesperus

Shaggy Mane 20 Coprinus comatus

bird's-foot trefoil 21 Lotus corniculatus

Rainbow Trout 22 Oncorhynchus mykiss

Brown Trout 23 Salmo trutta

common dandelion 24 Taraxacum officinale

Wolf's Milk 25 Lycogala epidendrum

common stork's-bill 26 Erodium cicutarium

dame's-violet 27 Hesperis matronalis

wild geranium 28 Geranium maculatum

boxelder maple 29 Acer negundo

common jewelweed 30 Impatiens capensis

butterfly milkweed 31 Asclepias tuberosa

Polyphemus Moth 32 Antheraea polyphemus

Widow Skimmer 33 Libellula luctuosa

broadleaf arrowhead 34 Sagittaria latifolia

Hound's-tongue 35 Cynoglossum officinale

Cornflower 36 Centaurea cyanus

common Douglas-fir 37 Pseudotsuga menziesii

Common Silverfish 38 Lepisma saccharina

ponderosa pine 39 Pinus ponderosa

Asian Lady Beetle 18 Harmonia axyridis

Painted Lady 40 Vanessa cardui

Catnip 41 Nepeta cataria

purple coneflower 42 Echinacea purpurea

American Plum 43 Prunus americana

Yellow Cosmos 44 Cosmos sulphureus

Monarch 3 Danaus plexippus

bulrush 45 Typha latifolia

Fly Agaric 46 Amanita muscaria

lodgepole pine 47 Pinus contorta

Wheel Bug 48 Arilus cristatus

Convergent Lady Beetle 49 Hippodamia convergens

Red Admiral 50 Vanessa atalanta

White-lined Sphinx 51 Hyles lineata

spotted coralroot 52 Corallorhiza maculata

Bluegill 53 Lepomis macrochirus

Brook Trout 54 Salvelinus fontinalis

common starlily 55 Leucocrinum montanum

Blinded Sphinx 56 Paonias excaecata

red baneberry 55 Actaea rubra

paper birch 57 Betula papyrifera

Halloween Pennant 58 Celithemis eponina

Virginia creeper 59 Parthenocissus quinquefolia

wild strawberry 60 Fragaria vesca

Hoary Comma 61 Polygonia gracilis

Gray Hairstreak 62 Strymon melinus

false Solomon's-seal 2 Maianthemum racemosum

Chinese lantern 2 Quincula lobata

Red-eared Slider 63 Trachemys scripta elegans

Common Checkered-Skipper 64 Pyrgus communis

Pallid-winged Grasshopper 65 Trimerotropis pallidipennis

Greater Bee Fly 66 Bombylius major

Seven-spotted Ladybird 18 Coccinella septempunctata

devil's beggarticks 67 Bidens frondosa

American Rubyspot 68 Hetaerina americana

Indian blanket 69 Gaillardia pulchella

Dainty Sulphur 2 Nathalis iole