Definition of ferruginous duck in English:
A Eurasian diving duck related to the pochard, the male of which has mainly dark red-brown breeding plumage.
- Aythya nyroca, family Anatidae
- My visit to the Laundry pond yielded only a few birds, a single little egret, a coot, a pair of little grebes, several ferruginous ducks and a small flock of mallards.
- There were about 50 coots, 25 shovelers, and a handful each of mallards and ferruginous ducks.
- The city boys trod gingerly in their trainers at first, but soon they were well into the mysteries of ferruginous duck, pigmy cormorants, marsh harriers and lesser white-fronted geese.