Tuesday, 12 February 2013

Karen Foil



The newly recognized Cackling Goose is a smaller version of the Canada Goose. Formerly considered the smallest subspecies of one variable species, recent work on genetic differences found the four smallest forms to be very different. These four races are now recognized as a full species: the Cackling Goose. It breeds farther northward and westward than does the Canada Goose.

Monday, 13 August 2012

Goose

Geese are waterfowl belonging to the tribe Anserini of the family Anatidae. This tribe comprises the genera Anser (the grey geese), Branta (the black geese) and Chen (the white geese). A number of other birds, mostly related to the shelducks, have "goose" as part of their name. More distantly related members of the Anatidae family are swans, most of which are larger than true geese, and ducks, which are smaller.

Thursday, 28 July 2011

Cackling Goose

The Cackling Goose (Branta hutchinsii), formerly known as Lesser or Small Canada 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 (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. 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. The smallest 1.4 kg-Cackling Geese (B. h. minima) are much smaller than any Canada Goose, but the subspecies B. h. hutchinsii, at up to 3 kg, 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.