ORNAMENTAL WATERFOWL. 145 
the female of our Mallard, the glossy-green head feathering of 
Anas boscas being absent in the Australian type. Amas 
superciliosa does not undergo the summer moult of the European 
species. It is occasionally for sale in England at from 30s. to 
42 10s. the pair. 
Male.—Head and upper body brown, an arched white 
stripe resembling an eyebrow passing from the bill to the back 
of the head, an exactly similar crescent meeting it below; 
throat and fore-neck yellowish-white ; wing-bar metallic-violet, 
bounded with black; under wing-coverts white; bill black ; 
legs brown. 
Female.—The same. 
Young. —No information. 
Egg.—Dark cream colour; eight to ten in number. 
June (in Europe). Incubation, twenty-eight to thirty days. 
YELLOW-BILLED DUCK. 
(Anas undulata, Anas flavirostris. Anas xanthorhyncha). 
This bird has bred freely in the Zoological Gardens, and 
is sufficiently common in our markets to be purchased at about 
44a pair. The first specimens possessed by the Zoological 
Society were obtained from Lord Derby’s collection in 1851, 
breeding in the gardens several times subsequently, and there 
are specimens on the waters at Woburn Abbey. It is a native 
of South Africa, where it is called the ‘“ Yellow-billed Teal,” 
and is, according to Layard and Sharpe, migratory, being 
usually seen in pairs, and breeding in considerable numbers 
among rushes and rocks at the lake of Vogel Vley; the nests 
are generally placed in a dense bush, and the female sits so 
close as to allow herself to be trodden on before rising. The 
nesting season in Africa is October. This bird greatly resembles 
