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Illustrated Checklist
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Native and Naturalized (373)
Exotic: Escapee (22)
Hybrids (24)
- Swan Goose x Canada Goose (hybrid) Anser cygnoides x Branta canadensisLast observed by Allan Spradling on 18 Nov 2012
- Greater White-fronted x Canada Goose (hybrid) Anser albifrons x Branta canadensisLast observed by Tim Carney on 10 Feb 2013
- Graylag x Canada Goose (hybrid) Anser anser x Branta canadensisLast observed by Anonymous eBirder on 1 Jan 2024
- Snow x Canada Goose (hybrid) Anser caerulescens x Branta canadensisLast observed by Tim Carney on 22 Dec 2018
- Eurasian x American Wigeon (hybrid) Mareca penelope x americanaLast observed by Libby Errickson on 16 Dec 2023
- Muscovy Duck x Mallard (hybrid) Cairina moschata x Anas platyrhynchosLast observed by James Wronski on 8 Jan 2024
- Wood Duck x Mallard (hybrid) Aix sponsa x Anas platyrhynchosLast observed by Darryl Yetman on 12 Mar 2022
- Gadwall x Mallard (hybrid) Mareca strepera x Anas platyrhynchosLast observed by Port of Baltimore on 14 Apr 2023
- Mallard x American Black Duck (hybrid) Anas platyrhynchos x rubripesLast observed by Tim Carney on 23 Mar 2024
- Mallard x Northern Pintail (hybrid) Anas platyrhynchos x acutaLast observed by Nico Sarbanes on 4 Mar 2023
- Redhead x Greater Scaup (hybrid) Aythya americana x marilaLast observed by Tim Carney on 13 Feb 2021
- Redhead x scaup sp. (hybrid) Aythya americana x marila/affinisLast observed by Tim Carney on 5 Jan 2021
- Ring-necked Duck x scaup sp. (hybrid) Aythya collaris x marila/affinisLast observed by Caleb Strand on 31 Oct 2023
- Bufflehead x Common Goldeneye (hybrid) Bucephala albeola x clangulaLast observed by Tim Carney on 21 Jan 2016
- Common Goldeneye x Hooded Merganser (hybrid) Bucephala clangula x Lophodytes cucullatusLast observed by Nico Sarbanes on 1 Mar 2022
- Herring x Great Black-backed Gull (hybrid) Larus argentatus x marinusLast observed by Bob Ringler on 16 Oct 1983
- Herring x Glaucous Gull (hybrid) Larus argentatus x hyperboreusLast observed by Tim Carney on 23 Jan 2022
- Red-shouldered x Red-tailed Hawk (hybrid) Buteo lineatus x jamaicensisLast observed by Debbie & Lou Taylor on 6 Feb 2017
- Carolina x Black-capped Chickadee (hybrid) Poecile carolinensis x atricapillusLast observed by Marshall Iliff on 27 Dec 2005
- Golden-winged x Blue-winged Warbler (hybrid) Vermivora chrysoptera x cyanopteraLast observed by Nico Sarbanes on 9 Sep 2020
- Brewster's Warbler (hybrid) Vermivora chrysoptera x cyanoptera (F1 hybrid)Last observed by Nico Sarbanes on 21 Sep 2022
- Lawrence's Warbler (hybrid) Vermivora chrysoptera x cyanoptera (F2 backcross)Last observed by Frank Marenghi on 20 Sep 2023
- Kentucky Warbler x Common Yellowthroat (hybrid) Geothlypis formosa x trichasLast observed by Port of Baltimore on 16 Aug 2021
- Northern Parula x Yellow-throated Warbler (hybrid) Setophaga americana x dominicaLast observed by Ray Kandt on 10 May 2021
Additional Taxa (116)
- Domestic goose sp. (Domestic type) Anser sp. (Domestic type)Last observed by Roger Katzenberg on 23 Apr 2024
- Trumpeter/Tundra Swan Cygnus buccinator/columbianusLast observed by Port of Baltimore on 12 May 2023
- Common/Red-breasted Merganser Mergus merganser/serratorLast observed by scott deamond on 14 Mar 2024
- Yellow-billed/Black-billed Cuckoo Coccyzus americanus/erythropthalmusLast observed by Anonymous eBirder on 1 Oct 2023
- Ruby-throated/Black-chinned Hummingbird Archilochus colubris/alexandriLast observed by MD Admin (Carney) on 2 Nov 2018
- Short-billed/Long-billed Dowitcher Limnodromus griseus/scolopaceusLast observed by Caleb Strand on 12 Oct 2023
- large shorebird sp. Scolopacidae sp. (large shorebird sp.)Last observed by Port of Baltimore on 21 Oct 2022
- Great/Double-crested Cormorant Phalacrocorax carbo/Nannopterum auritumLast observed by Charles Morgan Riegel on 30 Mar 2024
- Double-crested/Neotropic Cormorant Nannopterum auritum/brasilianumLast observed by Tim Carney on 6 Nov 2022
- Yellow-crowned/Black-crowned Night Heron Nycticorax nycticorax/Nyctanassa violaceaLast observed by Tim Carney on 17 Sep 2019
- Sharp-shinned/Cooper's Hawk Accipiter striatus/cooperiiLast observed by Anonymous eBirder on 24 Apr 2024
- Cooper's Hawk/American Goshawk Accipiter cooperii/atricapillusLast observed by Alina Martin on 18 Jan 2023
- Golden/Bald Eagle Aquila chrysaetos/Haliaeetus leucocephalusLast observed by Michael Woollen on 21 Jan 2023
- diurnal raptor sp. Accipitriformes/Falconiformes sp.Last observed by Libby Errickson on 28 Jan 2024
- Alder/Willow Flycatcher (Traill's Flycatcher) Empidonax alnorum/trailliiLast observed by Wendy Alexander on 29 Sep 2023
- Tropical/Couch's Kingbird Tyrannus melancholicus/couchiiLast observed by MD Admin (Carney) on 22 Aug 2016
- Philadelphia/Warbling Vireo Vireo philadelphicus/gilvusLast observed by Dennis Murphy on 1 Oct 2023
- Carolina/Black-capped Chickadee Poecile carolinensis/atricapillusLast observed by Caleb Strand on 6 Nov 2023
- Ruby-crowned/Golden-crowned Kinglet Corthylio calendula/Regulus satrapaLast observed by Brad Phoebus on 23 Apr 2024
- Gray-cheeked/Bicknell's Thrush Catharus minimus/bicknelliLast observed by Andy Beiderman on 26 May 2023
- Spizella sp./American Tree Sparrow Spizella/Spizelloides sp.Last observed by J. Isaacs on 12 Mar 2023
- Nelson's/Saltmarsh Sparrow (Sharp-tailed Sparrow) Ammospiza nelsoni/caudacutaLast observed by Peter Kaestner on 14 Dec 2021
- Bullock's/Baltimore Oriole Icterus bullockii/galbulaLast observed by MD Admin (Carney) on 22 Feb 1969
- Rusty/Brewer's Blackbird Euphagus carolinus/cyanocephalusLast observed by Tim Carney on 16 Feb 2023
- Louisiana/Northern Waterthrush Parkesia motacilla/noveboracensisLast observed by Sean Stewart on 24 Apr 2024
- Connecticut/MacGillivray's/Mourning Warbler Oporornis/Geothlypis sp. (Mourning-type)Last observed by Richard Edden on 8 Oct 2014
- Bay-breasted/Blackpoll Warbler Setophaga castanea/striataLast observed by Nico Sarbanes on 19 Oct 2023
- sparrow/warbler sp. (trilling song) Passerellidae/Parulidae sp. (trilling song)Last observed by Tim Carney on 10 Jun 2023