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Phillips
Illustrated Checklist
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Native and Naturalized (281)
Exotic: Provisional (1)
Hybrids (7)
- Ross's x Greater White-fronted Goose (hybrid) Anser rossii x albifronsLast observed by Steven Mlodinow on 18 Mar 2022
- Greater White-fronted x Cackling Goose (hybrid) Anser albifrons x Branta hutchinsiiLast observed by David Suddjian on 12 Nov 2019
- Blue-winged x Cinnamon Teal (hybrid) Spatula discors x cyanopteraLast observed by Mark Peterson on 28 Apr 2021
- Mallard x American Black Duck (hybrid) Anas platyrhynchos x rubripesLast observed by Colorado Bird Records Committee on 30 Nov 2002
- Ring-necked Duck x Lesser Scaup (hybrid) Aythya collaris x affinisLast observed by Steven Mlodinow on 5 Apr 2014
- Bullock's x Baltimore Oriole (hybrid) Icterus bullockii x galbulaLast observed by Luke Pheneger on 14 May 2022
- Lazuli x Indigo Bunting (hybrid) Passerina amoena x cyaneaLast observed by David Dowell on 22 May 2021
Additional Taxa (45)
- Eastern/Mexican Whip-poor-will Antrostomus vociferus/arizonaeLast observed by Steven Mlodinow on 18 Sep 2013
- Short-billed/Long-billed Dowitcher Limnodromus griseus/scolopaceusLast observed by Mark Peterson on 8 May 2021
- large shorebird sp. Scolopacidae sp. (large shorebird sp.)Last observed by Nathan Pieplow on 15 May 2015
- Sharp-shinned/Cooper's Hawk Accipiter striatus/cooperiiLast observed by Kathy Mihm Dunning on 30 Aug 2019
- Western/Eastern Wood-Pewee Contopus sordidulus/virensLast observed by David de Rivera Tønnessen on 4 Sep 2021
- Alder/Willow Flycatcher (Traill's Flycatcher) Empidonax alnorum/trailliiLast observed by David Dowell on 17 May 2020
- Spotted/Eastern Towhee (Rufous-sided Towhee) Pipilo maculatus/erythrophthalmusLast observed by William Kaempfer on 5 May 2016
- Rose-breasted/Black-headed Grosbeak Pheucticus ludovicianus/melanocephalusLast observed by David Dowell on 15 May 2022