The Snow Goose (Chen caerulescens) is a North American species of goose. Its name derives from the typically white plumage. The genus of this bird is disputed. The American Ornithologists' Union and BirdLife International for example place this species and the other two "white" geese in the Chen genus, while some other authorities place it in the more traditional "grey" goose genus Anser.
This goose breeds in northern Canada and the northeastern tip of Siberia, and winters much further south in the continent in the southern USA and beyond.
This species is a rare vagrant to Europe, but a frequent escape from collections and an occasional feral breeder. For example, Snow Geese are rare visitors to the British Isles where they are seen regularly among flocks of Barnacle, Brent and Greenland White-fronted geese. There is also a feral population in Scotland from which many vagrant birds in Britain seem to derive. In Central America, vagrants are not infrequently encountered during the winter months.The smaller of the two subspecies, the Lesser Snow Goose (C. c. caerulescens), lives from central northern Canada to the Bering Straits area. It commonly occurs in two plumage morphs. White-morph birds are white except for black wing tips, but blue-morph geese have bluish-grey plumage replacing most of the white except on the head, neck and tail tip. White- and blue-morph birds do interbreed and the offspring may be of either morph. The Lesser Snow Goose averages about 2.45 kg (5.4 lbs) and 70 cm (28 in). The larger
subspecies, the Greater Snow Goose (C. c. atlanticus), nests to the north of eastern Canada. The Greater Snow Goose averages about 3.2 kg (7 lbs) and 79 cm (31 in), but can weigh up to 4.5 kg (10 lbs). Blue-morph birds are rare among the Greater Snow Geese. The wingspan ranges from 135 to 165 cm (53 to 65 in).Snow geese mainly eat plant material found in shallow water or on land. Outside of the nesting season, they usually feed in flocks. In winter, snow geese feed on left-over grain in fields. They migrate in large flocks, often visiting traditional stopover habitats in spectacular numbers.
Their nests are usually located in a slightly elevated location on the ground, built with plant material and lined with down. They mate for life.
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