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Williamson
Illustrated Checklist
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Native and Naturalized (260)
Exotic: Escapee (3)
Hybrids (1)
Additional Taxa (31)
- Domestic goose sp. (Domestic type) Anser sp. (Domestic type)Last observed by AC Hassall on 16 Apr 2023
- Mallard/American Black Duck Anas platyrhynchos/rubripesLast observed by Gregg Zollinger on 13 Feb 2023
- Short-billed/Long-billed Dowitcher Limnodromus griseus/scolopaceusLast observed by Stephen J. Stedman on 27 Jul 1986
- Sharp-shinned/Cooper's Hawk Accipiter striatus/cooperiiLast observed by Cameron Cohen on 20 Apr 2024
- Alder/Willow Flycatcher (Traill's Flycatcher) Empidonax alnorum/trailliiLast observed by Hugh Barger on 2 Sep 2022
- Philadelphia/Red-eyed Vireo Vireo philadelphicus/olivaceusLast observed by Graham Gerdeman on 1 May 2018