scaup

scaup
[skɔːp]
noun

a Eurasian, North American, and New Zealand diving duck, the male of which has a black head with a green or purple gloss
（分布于欧亚大陆、北美洲和新西兰的）斑背潜鸭
Genus Aythya, family Anatidae: three species, in particular the widespread greater scaup (A. marila), with a black breast and white sides
潜鸭属，鸭科： 3种，尤指分布广泛的斑背潜鸭（拉丁名A. marila ）

语源

late 17th cent.: Scots variant of Scots and northern English scalp 'mussel-bed', a feeding ground of the duck