This 45���51 cm duck looks like a small goose , and feeds mostly by grazing in flocks. The male is grey with a dark brown head and mottled breast. The female has white stripes above and below the eye and mottled underparts. Both sexes have grey wings with black primaries and a white speculum .
The most common call is a loud, rising gnow sound. ... source: Wikipedia
External resources:Record a Sighting