The mallard is a medium-sized waterfowl species that is often slightly heavier than most other dabbling ducks. Mallards are 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. Known from all, a classic duck.