File:Pato de Crista.jpg

English: The goose-like comb duck gets its common name from the large, fleshy, dark grey growth or ‘comb’ on the top of the male’s black beak, an unusual and distinctive structure which enlarges during the breeding season . Male comb ducks are large birds, with glossy blue-black or green-black upperparts, tail and wings, white underparts and pale grey or black flanks. The top of the head and back of the neck are black, and the rest of the head is white, speckled black, with yellow tinges on the sides and on the neck during the breeding season. Narrow black bands run along the sides of the upper breast. The comb duck’s legs and feet are dark grey, and the eyes dark brown. Females are much smaller than males, with less glossy plumage, less well-defined black breast bands, more speckling on the head, which lacks any yellowish tinge, and sometimes with brownish mottling on the underparts. Females may appear almost white, and also lack the male’s ‘comb’.Wikipedia