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Illustrated Checklist
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Native and Naturalized (303)
Hybrids (8)
- Blue-winged x Cinnamon Teal (hybrid) Spatula discors x cyanopteraLast observed by Hal Stamm on 6 Jun 2011
- Gadwall x Mallard (hybrid) Mareca strepera x Anas platyrhynchosLast observed by David de Rivera Tønnessen on 31 Oct 2019
- Mallard x Mexican Duck (hybrid) Anas platyrhynchos x diaziLast observed by David de Rivera Tønnessen on 15 Jul 2023
- Western x Clark's Grebe (hybrid) Aechmophorus occidentalis x clarkiiLast observed by Steven Mlodinow on 2 Jun 2023
- Herring x Glaucous Gull (hybrid) Larus argentatus x hyperboreusLast observed by David de Rivera Tønnessen on 14 Nov 2018
- Western x Glaucous-winged Gull (hybrid) Larus occidentalis x glaucescensLast observed by Steven Mlodinow on 16 Oct 2021
- Herring x Glaucous-winged Gull (hybrid) Larus argentatus x glaucescensLast observed by Steven Mlodinow on 29 Sep 2020
- Glossy x White-faced Ibis (hybrid) Plegadis falcinellus x chihiLast observed by Steven Mlodinow on 10 Jul 2021
Additional Taxa (93)
- Blue-winged/Cinnamon Teal Spatula discors/cyanopteraLast observed by Kathy Mihm Dunning on 7 Sep 2023
- Common/Red-breasted Merganser Mergus merganser/serratorLast observed by Julie Hendricksen on 8 Jul 2023
- Western/Clark's Grebe Aechmophorus occidentalis/clarkiiLast observed by Joseph Tuttle on 17 Nov 2023
- Short-billed/Long-billed Dowitcher Limnodromus griseus/scolopaceusLast observed by Alan Ketcham on 22 Oct 2019
- Red/Red-necked Phalarope Phalaropus fulicarius/lobatusLast observed by Steven Mlodinow on 15 Oct 2019
- Western/Semipalmated Sandpiper Calidris mauri/pusillaLast observed by Charles Campbell on 30 Aug 2021
- large shorebird sp. Scolopacidae sp. (large shorebird sp.)Last observed by Sean Huntley on 22 Oct 2023
- jaeger sp. Stercorarius sp. (jaeger sp.)Last observed by Colorado Bird Records Committee on 30 Aug 1987
- Laughing/Franklin's Gull Leucophaeus atricilla/pipixcanLast observed by David de Rivera Tønnessen on 15 Jul 2023
- Double-crested/Neotropic Cormorant Nannopterum auritum/brasilianumLast observed by Michael Britten on 23 Mar 2024
- Glossy/White-faced Ibis Plegadis falcinellus/chihiLast observed by Kathy Mihm Dunning on 7 Sep 2023
- Sharp-shinned/Cooper's Hawk Accipiter striatus/cooperiiLast observed by Joseph Tuttle on 4 Nov 2023
- Hammond's/Dusky Flycatcher Empidonax hammondii/oberholseriLast observed by Leanne Presley on 12 Aug 2023
- Cassin's/Plumbeous Vireo Vireo cassinii/plumbeusLast observed by Denver Field Ornithologists on 29 Aug 2023
- solitary vireo sp. Vireo cassinii/solitarius/plumbeusLast observed by Anonymous eBirder on 12 Sep 2015
- Loggerhead/Northern Shrike Lanius ludovicianus/borealisLast observed by Blair Debban on 14 Oct 2023
- Black-capped/Mountain Chickadee Poecile atricapillus/gambeliLast observed by Jeff Percell on 29 Sep 2023
- Tree/Violet-green Swallow Tachycineta bicolor/thalassinaLast observed by Seth Miller on 14 Jul 2021
- Ruby-crowned/Golden-crowned Kinglet Corthylio calendula/Regulus satrapaLast observed by Bruce Morrison on 5 Jul 2023
- new world goldfinch sp. Spinus sp. (goldfinch sp.)Last observed by Meredith Swartwout on 26 Aug 2022
- Spizella sp./American Tree Sparrow Spizella/Spizelloides sp.Last observed by Anonymous eBirder on 20 May 2023
- Spotted/Eastern Towhee (Rufous-sided Towhee) Pipilo maculatus/erythrophthalmusLast observed by Scott Somershoe on 23 Jul 2015
- Rose-breasted/Black-headed Grosbeak Pheucticus ludovicianus/melanocephalusLast observed by Diane Quantic on 4 Sep 2023