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West Potomac Park--Tidal Basin
Illustrated Checklist
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Native and Naturalized (203)
Hybrids (2)
- Graylag x Canada Goose (hybrid) Anser anser x Branta canadensisLast observed by Xiao Xue on 6 Jun 2020
- Herring x Glaucous Gull (hybrid) Larus argentatus x hyperboreusLast observed by Ian Davies on 4 Mar 2009
Additional Taxa (27)
- Yellow-billed/Black-billed Cuckoo Coccyzus americanus/erythropthalmusLast observed by Doug Batt on 30 Sep 1981
- Ruby-crowned/Golden-crowned Kinglet Corthylio calendula/Regulus satrapaLast observed by Katie Hodge on 9 Nov 2018