Water bird : Any aquatic bird; a water fowl.

Example:


Taxonomy
species, ducks, subfamily, dabbling ducks, geese, Middle Miocene, Tadorninae, swans, Late Miocene, Family Anatidae, subfamily Anserinae, indet, Early Miocene, Australia, family, New Zealand geese, birds, genus.

Defination from the web:
birds that are adapted through evolution for swimming, floating on the water surface, and in some cases ... Combined with their body shape this can make some species awkward on land, but they are stronger walkers than other marine and water birds such as grebes or petrels. ...