Rich rusty brown overall with contrasting white triangular patch under tail; male has pale eye. Also note peaked crown and rather long gray bill. In flight, both sexes show bold white wing stripe. Compare to female Tufted Duck (can have similar white patch under tail). Inhabits lakes and marshes, usually with surrounding reeds. Rather shy and often stays hidden in reeds, but at other times out on open water with flocks of Tufted Duck and Common Pochard.