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Philadelphia
Illustrated Checklist
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Native and Naturalized (350)
Exotic: Escapee (15)
Hybrids (14)
- Swan Goose x Canada Goose (hybrid) Anser cygnoides x Branta canadensisLast observed by Debbie Beer on 31 Mar 2024
- Domestic goose sp. x Canada Goose (hybrid) Anser sp. (Domestic type) x Branta canadensisLast observed by Rich Ziegler on 27 Jan 2024
- Gadwall x Mallard (hybrid) Mareca strepera x Anas platyrhynchosLast observed by Gary Jarvis on 17 Apr 2018
- Mallard x American Black Duck (hybrid) Anas platyrhynchos x rubripesLast observed by Bob McGarry on 28 Apr 2024
- Mallard x Northern Pintail (hybrid) Anas platyrhynchos x acutaLast observed by Christine Murray on 7 Dec 2013
- Ring-necked Duck x scaup sp. (hybrid) Aythya collaris x marila/affinisLast observed by Jim Carr on 14 Jun 2020
- Black-headed x Ring-billed Gull (hybrid) Chroicocephalus ridibundus x Larus delawarensisLast observed by George Armistead | Hillstar Nature on 12 Jan 2014
- Herring x Glaucous Gull (hybrid) Larus argentatus x hyperboreusLast observed by George Armistead | Hillstar Nature on 12 Jan 2014
- Herring x Lesser Black-backed Gull (hybrid) Larus argentatus x fuscusLast observed by Jason Horn on 17 Nov 2019
- Carolina x Black-capped Chickadee (hybrid) Poecile carolinensis x atricapillusLast observed by Benjamin Filreis on 14 Feb 2023
- Dark-eyed Junco x White-throated Sparrow (hybrid) Junco hyemalis x Zonotrichia albicollisLast observed by Benjamin Filreis on 4 May 2022
- Golden-winged x Blue-winged Warbler (hybrid) Vermivora chrysoptera x cyanopteraLast observed by Benjamin Filreis on 24 Aug 2023
- Brewster's Warbler (hybrid) Vermivora chrysoptera x cyanoptera (F1 hybrid)Last observed by Gabriel Galson on 8 May 2021
- Lawrence's Warbler (hybrid) Vermivora chrysoptera x cyanoptera (F2 backcross)Last observed by Liam Hart on 22 Aug 2023
Additional Taxa (103)
- Domestic goose sp. (Domestic type) Anser sp. (Domestic type)Last observed by Tony Croasdale on 24 Apr 2024
- Trumpeter/Tundra Swan Cygnus buccinator/columbianusLast observed by Victoria Sindlinger on 8 Jan 2020
- Mallard/American Black Duck Anas platyrhynchos/rubripesLast observed by Tony Croasdale on 24 Apr 2024
- Common/Red-breasted Merganser Mergus merganser/serratorLast observed by Martin Dellwo on 15 Apr 2024
- Yellow-billed/Black-billed Cuckoo Coccyzus americanus/erythropthalmusLast observed by Claire Sosnowicz on 9 Apr 2022
- Short-billed/Long-billed Dowitcher Limnodromus griseus/scolopaceusLast observed by Michael Walter on 14 May 2022
- Great/Double-crested Cormorant Phalacrocorax carbo/Nannopterum auritumLast observed by Tom Filip on 29 Apr 2024
- Yellow-crowned/Black-crowned Night Heron Nycticorax nycticorax/Nyctanassa violaceaLast observed by Martin Dellwo on 25 Jun 2023
- Sharp-shinned/Cooper's Hawk Accipiter striatus/cooperiiLast observed by Sharon Meeker on 1 May 2024
- Downy/Hairy Woodpecker Dryobates pubescens/villosusLast observed by Victoria Sindlinger on 29 Apr 2024
- Alder/Willow Flycatcher (Traill's Flycatcher) Empidonax alnorum/trailliiLast observed by Martin Dellwo on 13 Oct 2023
- Carolina/Black-capped Chickadee Poecile carolinensis/atricapillusLast observed by Carine Mitchell on 21 Apr 2024
- Ruby-crowned/Golden-crowned Kinglet Corthylio calendula/Regulus satrapaLast observed by Rand Quinn on 13 Apr 2024
- Gray-cheeked/Bicknell's Thrush Catharus minimus/bicknelliLast observed by Tanya Burnett on 13 Oct 2023
- Spizella sp./American Tree Sparrow Spizella/Spizelloides sp.Last observed by Martin Dellwo on 17 Mar 2013
- Bullock's/Baltimore Oriole Icterus bullockii/galbulaLast observed by Benjamin Filreis on 8 Dec 2021
- Louisiana/Northern Waterthrush Parkesia motacilla/noveboracensisLast observed by Mad Evans on 1 May 2024
- Golden-winged/Blue-winged Warbler Vermivora chrysoptera/cyanopteraLast observed by Benjamin Filreis on 29 Aug 2023
- Dark-eyed Junco/Pine Warbler Junco hyemalis/Setophaga pinusLast observed by Benjamin Filreis on 7 Mar 2023
- Setophaga sp. Setophaga sp.Last observed by R. Dale Twining (1921-2014) Birding Records Project Data on 9 May 1993