What colour is the head of an adult male mallard?
Mallard measurements, the wing chord is , the bill is , and the tarsus is . The breeding male mallard is unmistakable, with a glossy bottle-green head and a white collar that demarcates the head from the purple-tinged brown breast, grey-brown wings, and a pale grey belly. The rear of the male is black, with white-bordered dark tail feathers. The bill of the male is a yellowish-orange tipped with black, with that of the female generally darker and ranging from black to mottled orange and brown. The female mallard is predominantly mottled, with each individual feather showing sharp contrast from buff
Mallard and the mottled duck ("A.fulvigula"), which is somewhat darker than the female mallard, and with slightly different bare-part colouration and no white edge on the speculum. In captivity, domestic ducks come in wild-type plumages, white, and other colours. Most of these colour variants are also known in domestic mallards not bred as livestock, but kept as pets, aviary birds, etc., where they are rare but increasing in availability. A noisy species, the female has the deep "quack" stereotypically associated with ducks. Male mallards make a sound phonetically similar to that of the female, a typical "quack", but it is a