The White-winged Scoter is a large sea duck with a heavy, sloping bill and bold white patches in the wing. Males are velvety black with a dashing, upturned comma of white around the eye and an orange-tipped bill.
In winter these birds eat mussels, holding their breath for a minute or more, deep underwater, while they wrestle the shellfish free from rocks.
They breed around lakes of the far north, where their diet changes to crustaceans and insects. Cornell All About Birds
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