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Illustrated Checklist
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Native and Naturalized (363)
Exotic: Escapee (2)
Hybrids (11)
- Domestic goose sp. x Canada Goose (hybrid) Anser sp. (Domestic type) x Branta canadensisLast observed by Sean Williams on 17 Sep 2017
- Eurasian x American Wigeon (hybrid) Mareca penelope x americanaLast observed by Bird Observer Data on 18 Apr 2011
- American Wigeon x Mallard (hybrid) Mareca americana x Anas platyrhynchosLast observed by Rick Heil on 25 Oct 2023
- Mallard x American Black Duck (hybrid) Anas platyrhynchos x rubripesLast observed by Rick Heil on 4 Dec 2023
- Common x Barrow's Goldeneye (hybrid) Bucephala clangula x islandicaLast observed by Bird Observer Data on 3 Feb 2008
- Dunlin x White-rumped Sandpiper (hybrid) Calidris alpina x fuscicollisLast observed by Suzanne Sullivan on 14 Sep 2013
- Herring x Glaucous Gull (hybrid) Larus argentatus x hyperboreusLast observed by John Keeley on 2 Jun 2013
- Tricolored Heron x Snowy Egret (hybrid) Egretta tricolor x thulaLast observed by Sam Miller on 23 Apr 2016
- Golden-winged x Blue-winged Warbler (hybrid) Vermivora chrysoptera x cyanopteraLast observed by Suzanne Sullivan on 8 May 2014
- Lawrence's Warbler (hybrid) Vermivora chrysoptera x cyanoptera (F2 backcross)Last observed by Sam Miller on 5 May 2019
Additional Taxa (71)
- Domestic goose sp. (Domestic type) Anser sp. (Domestic type)Last observed by Tony Baldasaro on 28 Aug 2021
- Common/Red-breasted Merganser Mergus merganser/serratorLast observed by Margo Goetschkes on 5 Apr 2024
- Yellow-billed/Black-billed Cuckoo Coccyzus americanus/erythropthalmusLast observed by Eric Labato on 14 May 2022
- Common Ringed/Semipalmated Plover Charadrius hiaticula/semipalmatusLast observed by Neil Hayward on 25 Aug 2019
- Short-billed/Long-billed Dowitcher Limnodromus griseus/scolopaceusLast observed by Eric Labato on 11 Sep 2023
- white-winged gull sp. Larus sp. (white-winged gull sp.)Last observed by Suzanne Sullivan on 27 Jan 2017
- Cory's/Great Shearwater Calonectris diomedea/Ardenna gravisLast observed by Rick Heil on 10 Aug 2022
- Yellow-crowned/Black-crowned Night Heron Nycticorax nycticorax/Nyctanassa violaceaLast observed by John Keeley on 11 Oct 2015
- Sharp-shinned/Cooper's Hawk Accipiter striatus/cooperiiLast observed by Will Kostick on 13 May 2023
- Alder/Willow Flycatcher (Traill's Flycatcher) Empidonax alnorum/trailliiLast observed by Eric Labato on 12 Aug 2023
- Philadelphia/Warbling Vireo Vireo philadelphicus/gilvusLast observed by Fred Bouchard on 22 May 2018
- Gray-cheeked/Bicknell's Thrush Catharus minimus/bicknelliLast observed by Bird Observer Data on 17 Sep 2011
- Spizella sp./American Tree Sparrow Spizella/Spizelloides sp.Last observed by John Hoye on 15 Mar 2018
- Nelson's/Saltmarsh Sparrow (Sharp-tailed Sparrow) Ammospiza nelsoni/caudacutaLast observed by Nevine Jacob on 3 Oct 2021
- Connecticut/MacGillivray's/Mourning Warbler Oporornis/Geothlypis sp. (Mourning-type)Last observed by Bird Observer Data on 3 Sep 2007
- Bay-breasted/Blackpoll Warbler Setophaga castanea/striataLast observed by John Young on 17 May 2015