THE GOLDEN-EYE DUCK Clangula glaucion (Linnæus) Breeding in Northern Europe, this species generally arrives here in October, and may be found sparingly on inland rivers and lakes, as well as in estuaries, becoming commoner in the north. In food and general habits it much resembles the preceding species, but its nest is placed in holes of trees at some distance from the ground, the old hole of a Black Woodpecker being frequently made use of in Scandinavia. The Lapps, in order to obtain the eggs of this and other kindred species, place nest-boxes in the pine and birch woods, the majority of which are tenanted by this species. The eggs, about twelve in number, are bright green. It has never been known to nest with us. The male has the head and upper neck glossy greenish black, with a conspicuous white oval patch under each eye; the rest of the upper parts, except the scapulars, black; scapulars, a large wing patch, and under parts white. Bill bluish black. Legs yellow, with black webs. The female has the black parts in the male replaced by greyish brown, and the white wing patch is much smaller in extent. The white spot below the eye is absent. The neck and breast are greyish. The young resemble the female. Length 18·5 in.; wing 8·25 in. THE BUFFEL-HEADED DUCK Clangula albeola (Linnæus) Only two or three examples of this North American species have been obtained in this country. In general coloration it bears a distant resemblance to the Golden-eye, but the male may be recognised by the presence of a large triangular white patch on the head, having its apex at the back of the eye. The female is a dull-coloured bird of various shades of brown. Length 15 in.; wing 6·75 in. THE LONG-TAILED DUCK Harelda glacialis (Linnæus) Like many other of our Ducks this is a species which breeds in the north and only visits us in winter. It is fairly common in the north of Scotland and adjoining islands, and there is some evidence that it may occasionally have stayed to breed in the Shetlands. On the east of England immature examples are sometimes shot, especially in severe winters, and the same may be said for the north of Ireland. Over the rest of our islands it is decidedly a rare bird. Like most Diving Ducks, its food consists of crustaceans and molluscs, and during the winter it is rarely found inland; in the breeding season, however, it frequents small meres and ponds, feeding largely on aquatic vegetation. The nest is placed near the water on the ground, and warmly lined with down. The eggs are of a bluish green colour.