Gadwall

The gadwall is a common and widespread dabbling duck 47–58cm long with a 78–85cm wingspan. Males average 990g and females 850g. The breeding male is patterned grey with a black rear end, light chestnut wings and a brilliant white speculum, obvious in flight or at rest, while the female is light brown, much like a female mallard. In eclipse plumage the male looks more like the female but keeps the male wing pattern (Wikipedia, general species account).

Females give a quack similar to a female mallard's but higher-pitched. It nests on the ground, often some distance from water; incubation lasts 24–27 days and the nestlings leave after one to two days. It is also seen in parts of South Asia, particularly southern India (Wikipedia, general species account).