The scoters are stocky in the genus Melanitta. The drakes are mostly black and have swollen bills, the females are brown. They breed in the far north of Europe, Asia, and North America, and bird migration further south in temperate zones of those continents. They form large flocks on suitable coastal waters. These are tightly packed, and the birds tend to take off together. Their lined nests are built on the ground close to the sea, lakes or rivers, in woodland or tundra. These species dive for crustaceans and mollusca.
The genus contains six species:
A fossil species, Melanitta kirbori, is known from the Early Pleistocene of Crimea. The presumed fossil "scoter" Melanitta ceruttii, which lived in California during the Late Pliocene, is now placed in the genus Histrionicus.
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