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Aythya marila
Large diving duck with glossy green-black head, white sides and belly, black tail, neck and breast, barred gray flanks and back. Eyes are yellow. Bill is blue-gray with a black tip. Feeds on insects, plants, vertebrates and mollusks. Rapid direct flight with strong rapid wing beats.
Breeds within the Arctic Circle, both in the Palearctic and North America. Also found in Asia, and is present in the Aleutian Islands year round. Spends the summer breeding in Alaska, Canada, Siberia, and northern Europe. In winter, it migrates down the coasts of North America, Europe, and Japan. Prefers ponds, marshes and lakes.
See this photo; lesser on left greater on right.
http://www.utahbirds.org/birdsofutah/Bir...