Male common mergansers have a black and white back with a white belly and a green head the underpart of the wings are white  that can also have a little bit of brown and black, the top part of the wings are black and white. The female common merganser has a gray back with a white belly and a brown head with a brown crest on the head, the underpart of the wings are white with a little bit of black and the top part of the wings are black with gray and white. Common mergansers eat fish, crustaceans, small animals, frogs and plants. Mergansers mainly live in lakes and rivers.

female

male

female