63 cm (25") Fairly common. Tundra lakes, Arctic coast; winters on east and west coasts and Great Lakes. Large diving bird with slender bill held tilted upward.
Summer: silvery gray face and sides of neck; black bill; large rusty throat patch; striped black and white lines run up back of neck; back brownish-black.
Winter: gray on back of neck gradually blends into white of throat; white underparts; blackish spotted upperparts; pale bill.
Song: rapid yelps.