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The head and upper neck is grayish, with a large, glossy colored patch on the foreneck. In the winter, the face and foreneck are pure white, and the upper part is dark brownish and finely spotted with white.
Males average slightly larger than females, and have a heavier head and bill.
It breeds mostly on fresh water, typically in fairly open moorland, and may occupy stretches of water of almost any size. It winters on inshore waters along sheltered coasts, occasionally inland.