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cackling goose
The cackling goose (''Branta hutchinsii'') is a North American bird of the genus ''Branta'' of black geese, which contains species with largely black plumage, distinguishing them from the grey ''Anser'' species.
==Description==
The black head and neck with white "chinstrap" distinguish this goose from all except the larger Canada goose (''Branta canadensis'') and the similarly sized barnacle goose (''B. leucopsis''). There are up to 5 subspecies of cackling goose, of varying sizes and plumage details. The female looks virtually identical but is slightly lighter and has a different voice. Some are hard to distinguish from the Canada goose, with which the cackling goose was long assumed to form one species, the cackling goose and the smaller Canada goose subspecies being called the lesser Canada goose. The smallest Cackling geese (''B. h. minima'') are much smaller than any Canada goose, but the subspecies ''B. h. hutchinsii'', at up to , grows to the same size as some Canada geese. The distinctness of the extinct population of the Komandorski and Kuril Islands ''B. h. asiatica'' is controversial. The barnacle goose differs in having a black breast and grey, rather than brownish, body plumage.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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