The Scaup Duck is very abundant in Holland during winter, covering the inland seas with immense flocks. It is found more sparingly in other continental countries. It breeds in the extreme north, both in the eastern and western hemispheres.
[37] 'Avis hæc _the Scaup Duck_ dicta est quoniam _scalpam_, i. e. pisces testaceos fractos seu contritos, esitat.'--WILLUGHBY, p. 279.
A white patch under the eye; head and neck black, lustrous with violet and green; back black; scapulars, great wing-coverts, speculum, and under parts, white; bill black; irides golden yellow; feet orange, with black membranes. _Female_--all the head and neck dark brown; feathers of the back dusky bordered with dark ash; greater wing-coverts white tipped with black; speculum and under parts white; tip of the bill yellowish, irides and feet pale yellow. Length eighteen and a half inches. Eggs buffy white.
This pretty, active little Duck is a regular winter visitant to the British shores, from autumn to spring, resorting to most of the localities frequented by other species, and frequently falling to the sportsman's gun, though little prized for the table. Females and young birds, called Mormons, are most numerous in England. They are very strong of flight, and are remarkable for making with their wings as they cleave the air a whistling sound, thought to resemble the tinkling of bells, whence the German name _die Schelle Ente_, Bell Duck, the Norfolk provincial name Rattle-Wing, and the systematic name _Clangula_. The young male does not make this noise, and having also dissimilar plumage from the adult, has been described by some authors as a distinct species under the name of Morillon.
The food of the Golden Eye varies with its haunts. In estuaries it feeds on crustaceous and molluscous animals and small fish, which it obtains by diving. In rivers and lakes it feeds principally on the larvæ and pupæ of insects, for which also it dives in clear deep water. The call-note is an unmelodious quack or croak.
The Golden Eye breeds only in high latitudes, and builds its nest in holes of trees, often at the height of twelve or fifteen feet from the water, into which it has been seen to convey its young one by one, holding them under the bill, and supported on its neck. The Lapps, in order to supply themselves with eggs, are in the habit of placing in the trees, on the banks of the rivers and lakes frequented by these birds, boxes with an entrance hole, which, though invariably robbed, are visited again and again.