_Cosmonetta histrionica_, the Harlequin Duck of Iceland, North-East Asia, Arctic America, and possibly the Urals, which reaches Japan, the United States, and exceptionally Britain and elsewhere in winter, is grey-blue, curiously marked with black and white on the head, neck, wings, and chest; the superciliary streaks and flanks are chestnut, the speculum being purple, the bill plumbeous, the feet brown. The female is brown with whitish cheeks and mottlings below. The habits of tumbling and diving in rocky torrents have been well described by Mr. Belding;[114] the nest is in banks or under boulders, and contains seven or eight buff eggs. _Harelda glacialis_, the Long-tailed Duck of the Arctic Regions, which appears to breed in Shetland, and in winter even reaches the Mediterranean and China, but more commonly the Caspian, Lake Baikal, Japan, and the middle United States, is at that season white with brownish patches on the sides of the neck, brown-black back, wings, central rectrices, and chest. In summer the crown, neck, and scapulars become brown, with rufous edges to the dorsal plumage. The bill is pinkish and black, the feet are bluish. The female is brown, with white ocular region, neck-ring, and lower parts. This noisy species is called, from its musical chattering note, "Calloo" in Shetland {121}and "Old Squaw" in America; it flies very swiftly and nests near water, laying from six to twelve oblong grey-green eggs. _Clangula glaucion_, the Golden-Eye, not yet proved to breed in Britain, though it does so in North Germany, the Caucasus, Siberia, and Maine, besides the Arctic Regions generally, is found in winter to the Mediterranean, and thence to North India, China, Japan, Mexico, and Cuba. The glossy head is green, with a slight crest and white cheek-patches; the upper parts are black with white on the wings and scapulars, the lower surface being white, the bill black, the iris golden, the feet orange. The female has the head and back brown, the chest grey. Similar to _Fuligula_ in general habits, the Rattlewing, as it is often termed from its noisy flight, is more partial to inland waters in winter, while for breeding it prefers hollow trees, or nest-boxes set up by Lapps and Finns, the ten or twelve eggs being bright green. _C. islandica_, the ordinary species in Iceland, differing from _C. glaucion_ in its purplish head, inhabits Arctic America also, and winters in the United States, rarely straying to Britain or the rest of Europe. _C. albeola_, the Buffel-head, of North America, which has visited the Commander Islands and Britain, has the head purplish-green with a large white occipital patch, the iris brown and the feet pinkish. It breeds to the northward, the eggs being whitish.