- See scaup.
- the scaup (of genus Aythya)
- Spermophaga, estrildid finches present in tropical Africa.
- A duck for the genus Fuligula. Two American types (Fuligula marila and Fuligula affinis) are normal. See scaup duck.
- A scaup duck; the blackhead (which see).
- diving ducks of the united states having a bluish-grey costs