Altai Snowcock

The Altai snowcock is a plump, partridge-like bird, and may be the largest snowcock, about 57–61 centimetres long, with a mean body mass of about 2.54 kilograms in females and 3 kilograms in males. The head and neck are slaty-grey with a partial dark collar at the base of the neck. The upperparts are grey with white spots and the tail is black; the chin, breast and belly are white, and the throat has a grey breastband with patches of black. (Wikipedia, general species account)

The primaries and secondaries are black, the primaries having white bases that show as a white flash in flight. The species is found in western Mongolia and adjacent areas of China, Kazakhstan and Russia, and its natural habitat is given as boreal forests. Most snowcocks are similar in size, but the Altai may be the largest of them. (Wikipedia, general species account)