bird genus - a genus of birds

Anatidae, family Anatidae - swimming birds having heavy short-legged bodies and bills with a horny tip: swans; geese; ducks

Bucephela albeola, bufflehead, butterball, dipper - small North American diving duck; males have bushy head plumage

Bucephela clangula, goldeneye, whistler - large-headed swift-flying diving duck of arctic regions