The Rosy-billed Pochard or simply Rosybill is among the most striking of southern South American ducks. The male is largely black with gray sides and a white area on the crissum; but most prominent is the bright red bill and a red eye. The bill itself has a large rounded knob at the base, which is bright crimson, while the rest of the bill gradually fades towards a pale pinkish towards the tip. Females, as in many ducks, are duller and browner and generally nondescript; the contrasting white crissum being the most obvious feature. In flight this duck is also an attention grabber as its largely dark plumage contrasts strongly with white primaries and secondaries. This duck is a diver and it is found only on fresh water, taking various lakes and ponds with ample emergent vegetation to breed in. During winter it may be found in larger concentrations in larger bodies of water, although always with emergent vegetation.