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Berkshire
Illustrated Checklist
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Native and Naturalized (315)
Exotic: Escapee (6)
Hybrids (11)
- Barnacle x Cackling Goose (hybrid) Branta leucopsis x hutchinsiiLast observed by Manuel Morales on 11 Oct 2017
- Domestic goose sp. x Canada Goose (hybrid) Anser sp. (Domestic type) x Branta canadensisLast observed by Betsy Bobo on 29 Mar 2024
- Snow x Canada Goose (hybrid) Anser caerulescens x Branta canadensisLast observed by Chip Blake on 14 Mar 2021
- Muscovy Duck x Mallard (hybrid) Cairina moschata x Anas platyrhynchosLast observed by Patricia Zucco on 8 Dec 2021
- Mallard x American Black Duck (hybrid) Anas platyrhynchos x rubripesLast observed by Ken Schopp on 7 Apr 2024
- Mallard x Northern Pintail (hybrid) Anas platyrhynchos x acutaLast observed by Thomas Kirby on 18 Oct 2020
- Mallard x Redhead (hybrid) Anas platyrhynchos x Aythya americanaLast observed by Greg Ward on 18 Dec 2016
- Bufflehead x Common Goldeneye (hybrid) Bucephala albeola x clangulaLast observed by Thomas Kirby on 27 Oct 2020
- Golden-winged x Blue-winged Warbler (hybrid) Vermivora chrysoptera x cyanopteraLast observed by Ben Nickley on 27 May 2022
- Brewster's Warbler (hybrid) Vermivora chrysoptera x cyanoptera (F1 hybrid)Last observed by Matthew Watson on 12 May 2022
- Lawrence's Warbler (hybrid) Vermivora chrysoptera x cyanoptera (F2 backcross)Last observed by Matthew Rymkiewicz on 9 May 2023
Additional Taxa (83)
- Domestic goose sp. (Domestic type) Anser sp. (Domestic type)Last observed by Ruth Green on 6 Jan 2024
- Mallard/American Black Duck Anas platyrhynchos/rubripesLast observed by Marshall Iliff on 1 May 2022
- Common/Barrow's Goldeneye Bucephala clangula/islandicaLast observed by Patricia Zucco on 8 Nov 2021
- Yellow-billed/Black-billed Cuckoo Coccyzus americanus/erythropthalmusLast observed by Hugh Powell on 23 Jun 2023
- Lesser/Greater Yellowlegs Tringa flavipes/melanoleucaLast observed by Jonathan Pierce on 5 Aug 2022
- Red-shouldered/Broad-winged Hawk Buteo lineatus/platypterusLast observed by Thomas Kirby on 14 May 2023
- Alder/Willow Flycatcher (Traill's Flycatcher) Empidonax alnorum/trailliiLast observed by Pauline Banducci on 1 Oct 2023
- Philadelphia/Warbling Vireo Vireo philadelphicus/gilvusLast observed by Stefan Townsend on 26 Sep 2023
- Loggerhead/Northern Shrike Lanius ludovicianus/borealisLast observed by Bird Observer Data on 10 Sep 2009
- Cliff/Cave Swallow Petrochelidon pyrrhonota/fulvaLast observed by Bird Observer Data on 23 Nov 2007
- Ruby-crowned/Golden-crowned Kinglet Corthylio calendula/Regulus satrapaLast observed by Rene Laubach on 28 Oct 1987
- Gray-cheeked/Bicknell's Thrush Catharus minimus/bicknelliLast observed by Liam Waters on 1 Oct 2023
- Spizella sp./American Tree Sparrow Spizella/Spizelloides sp.Last observed by Ruth Green on 31 Jan 2024
- Louisiana/Northern Waterthrush Parkesia motacilla/noveboracensisLast observed by John Young on 11 May 2021
- Golden-winged/Blue-winged Warbler Vermivora chrysoptera/cyanopteraLast observed by Thomas Kirby on 11 May 2023
- Bay-breasted/Blackpoll Warbler Setophaga castanea/striataLast observed by Noah Henkenius on 25 Sep 2022