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Frederick
Illustrated Checklist
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Native and Naturalized (314)
Exotic: Escapee (8)
Hybrids (8)
- Domestic goose sp. x Canada Goose (hybrid) Anser sp. (Domestic type) x Branta canadensisLast observed by Andy Wilson on 1 Feb 2022
- Snow x Canada Goose (hybrid) Anser caerulescens x Branta canadensisLast observed by Kathy Calvert on 20 Feb 2020
- Trumpeter x Tundra Swan (hybrid) Cygnus buccinator x columbianusLast observed by Jim Stasz on 24 Jul 1994
- Muscovy Duck x Mallard (hybrid) Cairina moschata x Anas platyrhynchosLast observed by Leigh Broadhurst on 17 May 2012
- Mallard x American Black Duck (hybrid) Anas platyrhynchos x rubripesLast observed by Andy Wilson on 29 Jan 2024
- Red-tailed x Rough-legged Hawk (hybrid) Buteo jamaicensis x lagopusLast observed by Tom Johnson on 8 Jan 2013
- Brewster's Warbler (hybrid) Vermivora chrysoptera x cyanoptera (F1 hybrid)Last observed by Brian Smith on 31 Aug 2022
- Lawrence's Warbler (hybrid) Vermivora chrysoptera x cyanoptera (F2 backcross)Last observed by MD Admin (Carney) on 3 May 1972
Additional Taxa (75)
- Domestic goose sp. (Domestic type) Anser sp. (Domestic type)Last observed by Tim Carney on 6 Apr 2024
- Mallard/American Black Duck Anas platyrhynchos/rubripesLast observed by Michael McDavit on 12 Feb 2021
- Yellow-billed/Black-billed Cuckoo Coccyzus americanus/erythropthalmusLast observed by Jordan Rutter on 17 Oct 2022
- Rufous/Allen's Hummingbird Selasphorus rufus/sasinLast observed by MD Admin (Carney) on 19 Aug 1998
- Short-billed/Long-billed Dowitcher Limnodromus griseus/scolopaceusLast observed by Howard Youth on 22 Sep 1990
- Sharp-shinned/Cooper's Hawk Accipiter striatus/cooperiiLast observed by Michelle Baird on 4 Mar 2024
- Golden/Bald Eagle Aquila chrysaetos/Haliaeetus leucocephalusLast observed by Kari McPartland on 27 Jan 2024
- Alder/Willow Flycatcher (Traill's Flycatcher) Empidonax alnorum/trailliiLast observed by Riley Metcalfe on 10 May 2023
- Carolina/Black-capped Chickadee Poecile carolinensis/atricapillusLast observed by marie maynard on 2 Apr 2024
- Ruby-crowned/Golden-crowned Kinglet Corthylio calendula/Regulus satrapaLast observed by Kathryn Mattingly on 30 Mar 2024
- Gray-cheeked/Bicknell's Thrush Catharus minimus/bicknelliLast observed by Andy Wilson NFC Station on 14 Sep 2023
- Spizella sp./American Tree Sparrow Spizella/Spizelloides sp.Last observed by don switzer on 30 Oct 2020
- Lincoln's/Swamp Sparrow Melospiza lincolnii/georgianaLast observed by Andy Wilson NFC Station on 20 Sep 2023
- Louisiana/Northern Waterthrush Parkesia motacilla/noveboracensisLast observed by Tyler Meneely on 14 May 2023
- Bay-breasted/Blackpoll Warbler Setophaga castanea/striataLast observed by Ryan Douglas on 30 Sep 2023