The greater scaup, just scaup in Europe or, colloquially, "bluebill" in North America,is a mid-sized diving duck, larger than the closely related lesser scaup. It spends the summer months breeding in Alaska, northern Canada, Siberia, and the northernmost reaches of Europe. During the winter, it migrates south to the coasts of North America, Europe, and Japan.

Greater scaup nest near water, typically on islands in northern lakes or on floating mats of vegetation. They eat aquatic molluscs, plants, and insects, which they obtain by diving underwater. They form large groups, called "rafts", that can number in the thousands.

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