Branta canadensis leucopareia / Aleutian Canada goose in Tierpark Cottbus
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ALEUTIAN CANADA GOOSE (Branta canadensis leucopareia). One of the smallest forms. Identified by white collar at the base of neck. Threatened sub Stock Photo - Alamy
A closer look at the hybrid Greylag X Canada Goose : r/geese
Cackling Goose Overview, All About Birds, Cornell Lab of Ornithology