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Insects & Arthropods of Denver, Colorado

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

51,664
recent observations
50
species listed
50
insects & arthropods

Naturalists have logged 51,664 research-grade observations across the 50 most-recorded species near Denver. The most frequently seen is the Western Honey Bee, with 3,941 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
3,941 observations
Bold Jumping Spider
Phidippus audax
2,603 observations
Painted Lady
Vanessa cardui
2,423 observations
Seven-spotted Lady Beetle
Coccinella septempunctata
1,956 observations
Japanese Beetle
Popillia japonica
1,900 observations
Monarch
Danaus plexippus
1,727 observations
Hunt's Bumble Bee
Bombus huntii
1,545 observations · iNaturalist
European Paper Wasp
Polistes dominula
1,540 observations
Two-tailed Swallowtail
Papilio multicaudata
1,364 observations · iNaturalist
Convergent Lady Beetle
Hippodamia convergens
1,359 observations
Two-striped Grasshopper
Melanoplus bivittatus
1,331 observations · iNaturalist
Golden Northern Bumble Bee
Bombus fervidus
1,230 observations
Four-spotted Moth
Tyta luctuosa
1,207 observations · iNaturalist
Brown-belted Bumble Bee
Bombus griseocollis
1,193 observations
Common Checkered-Skipper
Burnsius communis
1,184 observations · iNaturalist
Asian Lady Beetle
Harmonia axyridis
1,167 observations
Small White
Pieris rapae
1,159 observations
White-lined Sphinx
Hyles lineata
1,143 observations · iNaturalist
European Mantis
Mantis religiosa
1,026 observations
Western Black Widow
Latrodectus hesperus
1,014 observations
Eastern Boxelder Bug
Boisea trivittata
990 observations
Great Spreadwing
Archilestes grandis
922 observations · iNaturalist
Variegated Meadowhawk
Sympetrum corruptum
776 observations · iNaturalist
Western Conifer Seed Bug
Leptoglossus occidentalis
748 observations · iNaturalist
Small Milkweed Bug
Lygaeus kalmii
744 observations
Taxiles Skipper
Lon taxiles
741 observations · iNaturalist
Variegated Fritillary
Euptoieta claudia
740 observations
Widow Skimmer
Libellula luctuosa
729 observations
Red-femured Milkweed Borer
Tetraopes femoratus
729 observations · iNaturalist
Colorado Soldier Beetle
Chauliognathus basalis
715 observations · iNaturalist
Greater Anglewing
Microcentrum rhombifolium
681 observations · iNaturalist
Jagged Ambush Bug
Phymata americana
677 observations
Apache Jumping Spider
Phidippus apacheanus
672 observations · iNaturalist
Band-winged Meadowhawk
Sympetrum semicinctum
661 observations · iNaturalist
American Bumble Bee
Bombus pensylvanicus
652 observations
Nevada Bumble Bee
Bombus nevadensis
648 observations
Gray Hairstreak
Strymon melinus
640 observations
Corn Earworm Moth
Helicoverpa zea
633 observations · iNaturalist
Differential Grasshopper
Melanoplus differentialis
610 observations
Checkered White
Pontia protodice
607 observations · iNaturalist
Woodlouse Spider
Dysdera crocata
596 observations
Red-backed Darkling Beetle
Eleodes suturalis
583 observations · iNaturalist
Dainty Sulphur
Nathalis iole
573 observations
Common Whitetail
Plathemis lydia
567 observations
Blue Fungus Beetle
Cypherotylus californicus
519 observations · iNaturalist
Reakirt's Blue
Echinargus isola
511 observations · iNaturalist
Orange Sulphur
Colias eurytheme
508 observations
Sutured Longhorn Beetle
Batyle suturalis
505 observations · iNaturalist
Twelve-spotted Skimmer
Libellula pulchella
493 observations
European Harvestman
Phalangium opilio
482 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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