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Pennypack on the Delaware
Illustrated Checklist
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Native and Naturalized (267)
Exotic: Escapee (3)
Hybrids (3)
- Domestic goose sp. x Canada Goose (hybrid) Anser sp. (Domestic type) x Branta canadensisLast observed by Neha Nataraj on 15 Jan 2023
- Mallard x American Black Duck (hybrid) Anas platyrhynchos x rubripesLast observed by Christopher Hinkle on 3 Oct 2023
- Herring x Lesser Black-backed Gull (hybrid) Larus argentatus x fuscusLast observed by Jason Horn on 17 Nov 2019
Additional Taxa (60)
- dabbling duck sp. Anatidae sp. (dabbling duck sp.)Last observed by George Armistead | Hillstar Nature on 27 Oct 2020
- Great/Double-crested Cormorant Phalacrocorax carbo/Nannopterum auritumLast observed by Holger Pflicke on 10 Feb 2024
- Downy/Hairy Woodpecker Dryobates pubescens/villosusLast observed by Benjamin Filreis on 26 Jan 2022
- Alder/Willow Flycatcher (Traill's Flycatcher) Empidonax alnorum/trailliiLast observed by Martin Dellwo on 7 Oct 2023
- Carolina/Black-capped Chickadee Poecile carolinensis/atricapillusLast observed by Connor Smyth on 23 Mar 2023
- Gray-cheeked/Bicknell's Thrush Catharus minimus/bicknelliLast observed by Tanya Burnett on 13 Oct 2023
- Bullock's/Baltimore Oriole Icterus bullockii/galbulaLast observed by Benjamin Filreis on 8 Dec 2021