Birding Dude: Hybrid "Presumably" Brant X Cackling Goose in New York City...
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Brant Identification, All About Birds, Cornell Lab of Ornithology
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Brant Identification, All About Birds, Cornell Lab of Ornithology
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tundra swan (Cygnus columbianus), Canada goose (Branta canadensis), brent goose (Branta bernicla), black brant (Branta bernicla nigricans)
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