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Illustrated Checklist
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Native and Naturalized (304)
Exotic: Escapee (1)
Hybrids (6)
- Mallard x American Black Duck (hybrid) Anas platyrhynchos x rubripesLast observed by Joe Kaplan on 31 May 2023
- Laughing x Ring-billed Gull (hybrid) Leucophaeus atricilla x Larus delawarensisLast observed by Skye Haas on 8 Jul 2010
- Herring x Great Black-backed Gull (hybrid) Larus argentatus x marinusLast observed by Brian Johnson on 20 May 2021
- Herring x Glaucous Gull (hybrid) Larus argentatus x hyperboreusLast observed by Joe Kaplan on 12 Feb 2016
- Brewster's Warbler (hybrid) Vermivora chrysoptera x cyanoptera (F1 hybrid)Last observed by Joe McDonnell on 11 May 2022
- Lawrence's Warbler (hybrid) Vermivora chrysoptera x cyanoptera (F2 backcross)Last observed by Alec Olivier on 13 May 2018
Additional Taxa (79)
- Common/Red-breasted Merganser Mergus merganser/serratorLast observed by Laurie Johnson on 13 Mar 2024
- Yellow-billed/Black-billed Cuckoo Coccyzus americanus/erythropthalmusLast observed by Joanie & Mark Hubinger on 1 Jun 2018
- Ruby-throated/Black-chinned Hummingbird Archilochus colubris/alexandriLast observed by Ken Uslabar on 2 Aug 2010
- American/Pacific Golden-Plover (Lesser Golden-Plover) Pluvialis dominica/fulvaLast observed by Joanie & Mark Hubinger on 27 May 2013
- Short-billed/Long-billed Dowitcher Limnodromus griseus/scolopaceusLast observed by Joe McDonnell on 24 Aug 2020
- Parasitic/Pomarine Jaeger Stercorarius parasiticus/pomarinusLast observed by Joe Kaplan on 23 Sep 2014
- white-winged gull sp. Larus sp. (white-winged gull sp.)Last observed by Joe McDonnell on 8 Mar 2024
- Yellow-crowned/Black-crowned Night Heron Nycticorax nycticorax/Nyctanassa violaceaLast observed by Joe Kaplan on 31 Jul 2023
- Golden/Bald Eagle Aquila chrysaetos/Haliaeetus leucocephalusLast observed by paul shuart on 27 Sep 2019
- Red-shouldered/Broad-winged Hawk Buteo lineatus/platypterusLast observed by Ivan Wiljanen on 20 May 2023
- Alder/Willow Flycatcher (Traill's Flycatcher) Empidonax alnorum/trailliiLast observed by Joe McDonnell on 3 Aug 2023
- Spizella sp./American Tree Sparrow Spizella/Spizelloides sp.Last observed by William Green on 2 Nov 2017
- Golden-winged/Blue-winged Warbler Vermivora chrysoptera/cyanopteraLast observed by Tom Johnson on 1 Jun 2020
- Bay-breasted/Blackpoll Warbler Setophaga castanea/striataLast observed by Joe McDonnell on 4 Sep 2023