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Insects & Arthropods of Denver, Colorado

The insects & arthropods most often spotted near Denver, ranked by recent research-grade observations.

51,085
recent observations
50
species listed
50
insects & arthropods

Naturalists have logged 51,085 research-grade observations across the 50 most-recorded species near Denver. The most frequently seen is the Western Honey Bee, with 3,924 recorded sightings.

Rarer finds confirmed near Denver include Ambush Bug - uncommon enough that a sighting is worth logging.

Ambush Bug

Most-observed insects & arthropods near Denver

Western Honey Bee
Apis mellifera
3,924 observations
Bold Jumping Spider
Phidippus audax
2,588 observations
Painted Lady
Vanessa cardui
2,411 observations
Seven-spotted Lady Beetle
Coccinella septempunctata
1,938 observations
Japanese Beetle
Popillia japonica
1,896 observations
Monarch
Danaus plexippus
1,719 observations
Hunt's Bumble Bee
Bombus huntii
1,544 observations · iNaturalist
European Paper Wasp
Polistes dominula
1,540 observations
Two-tailed Swallowtail
Papilio multicaudata
1,353 observations · iNaturalist
Convergent Lady Beetle
Hippodamia convergens
1,352 observations
Two-striped Grasshopper
Melanoplus bivittatus
1,329 observations · iNaturalist
Golden Northern Bumble Bee
Bombus fervidus
1,217 observations
Four-spotted Moth
Tyta luctuosa
1,207 observations · iNaturalist
Common Checkered-Skipper
Burnsius communis
1,162 observations · iNaturalist
Asian Lady Beetle
Harmonia axyridis
1,160 observations
Small White
Pieris rapae
1,159 observations
White-lined Sphinx
Hyles lineata
1,138 observations · iNaturalist
Brown-belted Bumble Bee
Bombus griseocollis
1,043 observations
European Mantis
Mantis religiosa
1,012 observations
Western Black Widow
Latrodectus hesperus
1,009 observations
Eastern Boxelder Bug
Boisea trivittata
979 observations
Great Spreadwing
Archilestes grandis
916 observations · iNaturalist
Variegated Meadowhawk
Sympetrum corruptum
770 observations · iNaturalist
Taxiles Skipper
Lon taxiles
741 observations · iNaturalist
Western Conifer Seed Bug
Leptoglossus occidentalis
740 observations · iNaturalist
Variegated Fritillary
Euptoieta claudia
734 observations
Widow Skimmer
Libellula luctuosa
728 observations
Red-femured Milkweed Borer
Tetraopes femoratus
727 observations · iNaturalist
Colorado Soldier Beetle
Chauliognathus basalis
715 observations · iNaturalist
Small Milkweed Bug
Lygaeus kalmii
707 observations
Greater Anglewing
Microcentrum rhombifolium
680 observations · iNaturalist
Jagged Ambush Bug
Phymata americana
676 observations
Apache Jumping Spider
Phidippus apacheanus
671 observations · iNaturalist
Band-winged Meadowhawk
Sympetrum semicinctum
660 observations · iNaturalist
Gray Hairstreak
Strymon melinus
638 observations
Nevada Bumble Bee
Bombus nevadensis
633 observations
Corn Earworm Moth
Helicoverpa zea
631 observations · iNaturalist
Differential Grasshopper
Melanoplus differentialis
610 observations
Woodlouse Spider
Dysdera crocata
592 observations
Checkered White
Pontia protodice
586 observations · iNaturalist
Red-backed Darkling Beetle
Eleodes suturalis
583 observations · iNaturalist
Common Whitetail
Plathemis lydia
567 observations
American Bumble Bee
Bombus pensylvanicus
553 observations
Dainty Sulphur
Nathalis iole
547 observations
Blue Fungus Beetle
Cypherotylus californicus
519 observations · iNaturalist
Reakirt's Blue
Echinargus isola
508 observations · iNaturalist
Sutured Longhorn Beetle
Batyle suturalis
505 observations · iNaturalist
Orange Sulphur
Colias eurytheme
500 observations
Twelve-spotted Skimmer
Libellula pulchella
493 observations
European Harvestman
Phalangium opilio
475 observations · iNaturalist

Built from recent research-grade iNaturalist observations. Identifications are community-sourced and may occasionally be wrong, and the ranking reflects where people record and photograph wildlife, so a species seen often here is not necessarily rare elsewhere. Some plants and animals are only out in certain seasons. Treat this as a lively snapshot of what people are finding, not a formal checklist.

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