Whistling duck

The whistling ducks or tree ducks (Genus: "Dendrocygna") are a subfamily of the duck, goose and swan family of birds, Anatidae. In other taxonomy, they are considered a separate family called Dendrocygnidae.
Species.
There are eight species of whistling ducks, most of them live in or near the tropics, in a place where there is fresh water. Whistling ducks feed mainly on small animals and plants. 
Whistling ducks travel in flocks and migrate seasonally.