The Cackling Goose, colloquially Lesser or Small Canada/Canadian Goose in North America, belongs to the genus Branta of black geese, which contains species with largely black plumage, distinguishing them from the grey Anser species. The black head and neck with white "chinstrap" distinguish this goose from all except the larger Canada Goose and the similarly sized Barnacle Goose. There are up to 5 subspecies of Cackling Goose, of varying sizes and plumage details. Some are hard to distinguish from the Canada Goose, with which the Cackling Goose was long assumed to form one species, and the name Lesser Canada Goose properly denotes the subspecies parvipes of the Canada Goose.

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