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Imperial
Illustrated Checklist
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Native and Naturalized (429)
Exotic: Provisional (1)
Exotic: Escapee (16)
Hybrids (10)
- Blue-winged x Cinnamon Teal (hybrid) Spatula discors x cyanopteraLast observed by Bobby Wilcox on 25 Apr 2022
- Mallard x Mexican Duck (hybrid) Anas platyrhynchos x diaziLast observed by Ethan Monk on 9 Jun 2021
- Western x Clark's Grebe (hybrid) Aechmophorus occidentalis x clarkiiLast observed by Caleb Strand on 30 Dec 2018
- Anna's x Costa's Hummingbird (hybrid) Calypte anna x costaeLast observed by Gjon Hazard on 1 Dec 2023
- Herring x Glaucous Gull (hybrid) Larus argentatus x hyperboreusLast observed by Curtis Marantz on 30 Jul 2011
- Western x Glaucous-winged Gull (hybrid) Larus occidentalis x glaucescensLast observed by Zack Schlanger on 15 Dec 2020
- Herring x Glaucous-winged Gull (hybrid) Larus argentatus x glaucescensLast observed by Chris Dean on 29 Dec 2021
- Red-naped x Red-breasted Sapsucker (hybrid) Sphyrapicus nuchalis x ruberLast observed by Todd Easterla on 20 Jan 2024
- Barn x Cliff Swallow (hybrid) Hirundo rustica x Petrochelidon pyrrhonotaLast observed by Rob Fowler on 5 Apr 2013
- Townsend's x Hermit Warbler (hybrid) Setophaga townsendi x occidentalisLast observed by Joachim Bertrands on 3 May 2018
Additional Taxa (115)
- Domestic goose sp. (Domestic type) Anser sp. (Domestic type)Last observed by David Lerwill on 5 Feb 2020
- Cackling/Canada Goose Branta hutchinsii/canadensisLast observed by Elias Aristides Elias on 21 Nov 2010
- Common/Red-breasted Merganser Mergus merganser/serratorLast observed by Grigory Heaton on 2 Jan 2024
- Eurasian/African Collared-Dove Streptopelia decaocto/roseogriseaLast observed by Victor Stoll on 11 Aug 2022
- American/Pacific Golden-Plover (Lesser Golden-Plover) Pluvialis dominica/fulvaLast observed by Don Roberson on 15 Jul 1995
- Short-billed/Long-billed Dowitcher Limnodromus griseus/scolopaceusLast observed by Gjon Hazard on 19 Apr 2024
- Lesser/Greater Yellowlegs Tringa flavipes/melanoleucaLast observed by Kelsey Reckling on 19 Feb 2024
- large shorebird sp. Scolopacidae sp. (large shorebird sp.)Last observed by Akshay Surendra on 10 Jan 2024
- Long-tailed/Parasitic Jaeger Stercorarius longicaudus/parasiticusLast observed by Greg Homel on 13 Sep 2020
- Laughing/Franklin's Gull Leucophaeus atricilla/pipixcanLast observed by Kimball Garrett on 27 May 2017
- storm-petrel sp. (dark-rumped) Oceanitidae/Hydrobatidae sp. (dark-rumped)Last observed by Noah Arthur on 22 Aug 2023
- Double-crested/Neotropic Cormorant Nannopterum auritum/brasilianumLast observed by Cameron Tescher on 14 Apr 2024
- Sharp-shinned/Cooper's Hawk Accipiter striatus/cooperiiLast observed by Beatrix Kohlhaas on 9 Mar 2024
- Yellow-bellied/Red-naped Sapsucker Sphyrapicus varius/nuchalisLast observed by Andy Kleinhesselink on 4 Nov 2018
- Hammond's/Dusky Flycatcher Empidonax hammondii/oberholseriLast observed by Van Remsen on 25 Apr 1976
- yellow-bellied kingbird sp. Tyrannus sp. (yellow-bellied)Last observed by Brian Daniels on 23 Mar 1996
- California/Woodhouse's Scrub-Jay Aphelocoma californica/woodhouseiiLast observed by Camden Bruner on 16 Mar 2018
- Tree/Violet-green Swallow Tachycineta bicolor/thalassinaLast observed by Sean Fitzgerald on 26 Mar 2015
- Curve-billed/Bendire's Thrasher Toxostoma curvirostre/bendireiLast observed by Kimball Garrett on 21 Jan 2011
- Sagebrush/Bell's Sparrow (Sage Sparrow) Artemisiospiza nevadensis/belliLast observed by Chris Morris on 15 Jan 2024
- Townsend's/Hermit Warbler Setophaga townsendi/occidentalisLast observed by Curtis Marantz on 4 May 2014
- Rose-breasted/Black-headed Grosbeak Pheucticus ludovicianus/melanocephalusLast observed by Loren Wright on 3 Sep 2022