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Delaware
Illustrated Checklist
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Native and Naturalized (250)
Exotic: Escapee (2)
Hybrids (4)
- Mallard x American Black Duck (hybrid) Anas platyrhynchos x rubripesLast observed by Kevin Smith on 21 Nov 2020
- Mallard x Northern Pintail (hybrid) Anas platyrhynchos x acutaLast observed by Lance Verderame on 13 Mar 2022
- Common x Barrow's Goldeneye (hybrid) Bucephala clangula x islandicaLast observed by Lance Verderame on 17 Mar 2024
- Brewster's Warbler (hybrid) Vermivora chrysoptera x cyanoptera (F1 hybrid)Last observed by Lance Verderame on 4 Jul 2015
Additional Taxa (47)
- Domestic goose sp. (Domestic type) Anser sp. (Domestic type)Last observed by Randy&Carol Lynch on 24 Jun 2022
- Mallard/American Black Duck Anas platyrhynchos/rubripesLast observed by Michael Reid on 21 Jan 2022
- Common/Red-breasted Merganser Mergus merganser/serratorLast observed by Ethel Pulaski on 28 May 2021
- Yellow-billed/Black-billed Cuckoo Coccyzus americanus/erythropthalmusLast observed by Christopher Nadareski on 27 May 2021
- Sharp-shinned/Cooper's Hawk Accipiter striatus/cooperiiLast observed by Wes Blauvelt on 11 Nov 2023
- diurnal raptor sp. Accipitriformes/Falconiformes sp.Last observed by Franklin Mountain Hawkwatch on 18 Nov 2023
- Alder/Willow Flycatcher (Traill's Flycatcher) Empidonax alnorum/trailliiLast observed by Sam G on 22 May 2023
- Philadelphia/Warbling Vireo Vireo philadelphicus/gilvusLast observed by Alison Dundy on 20 May 2021
- Gray-cheeked/Bicknell's Thrush Catharus minimus/bicknelliLast observed by Lance Verderame on 17 Sep 2016
- Louisiana/Northern Waterthrush Parkesia motacilla/noveboracensisLast observed by Max Epstein on 17 Jun 2023
- Golden-winged/Blue-winged Warbler Vermivora chrysoptera/cyanopteraLast observed by Pamela Peters on 30 Jun 2023
- Bay-breasted/Blackpoll Warbler Setophaga castanea/striataLast observed by Lukas Musher on 31 Aug 2020