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Loudoun
Illustrated Checklist
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Native and Naturalized (301)
Exotic: Provisional (1)
Exotic: Escapee (7)
Hybrids (6)
- Graylag x Canada Goose (hybrid) Anser anser x Branta canadensisLast observed by Bryan Henson on 5 Feb 2022
- Domestic goose sp. x Canada Goose (hybrid) Anser sp. (Domestic type) x Branta canadensisLast observed by Jim McDaniel on 26 Jan 2022
- Mallard x American Black Duck (hybrid) Anas platyrhynchos x rubripesLast observed by Pat Whittle on 23 Feb 2024
- Golden-winged x Blue-winged Warbler (hybrid) Vermivora chrysoptera x cyanopteraLast observed by Gerco Hoogeweg on 9 May 2016
- Brewster's Warbler (hybrid) Vermivora chrysoptera x cyanoptera (F1 hybrid)Last observed by Will Johnson on 10 May 2021
- Lawrence's Warbler (hybrid) Vermivora chrysoptera x cyanoptera (F2 backcross)Last observed by Bruce Hill on 28 Apr 2005
Additional Taxa (63)
- Domestic goose sp. (Domestic type) Anser sp. (Domestic type)Last observed by Bryan Henson on 11 Feb 2023
- Common/Red-breasted Merganser Mergus merganser/serratorLast observed by Eric Anderson on 27 Dec 2022
- Yellow-billed/Black-billed Cuckoo Coccyzus americanus/erythropthalmusLast observed by Richard Gromadzki on 14 May 2023
- Alder/Willow Flycatcher (Traill's Flycatcher) Empidonax alnorum/trailliiLast observed by Nicole H on 15 Sep 2023
- Carolina/Black-capped Chickadee Poecile carolinensis/atricapillusLast observed by Bruce Hill on 20 Mar 2024
- Ruby-crowned/Golden-crowned Kinglet Corthylio calendula/Regulus satrapaLast observed by Scott Harris on 30 Sep 2023
- Gray-cheeked/Bicknell's Thrush Catharus minimus/bicknelliLast observed by Scott Baron on 14 May 2015
- Spizella sp./American Tree Sparrow Spizella/Spizelloides sp.Last observed by Nicole H on 2 Dec 2023
- Louisiana/Northern Waterthrush Parkesia motacilla/noveboracensisLast observed by Connee Chandler on 2 May 2023
- Bay-breasted/Blackpoll Warbler Setophaga castanea/striataLast observed by William Parkin on 2 Oct 2023