penguin

n.

Black and white seabird living in the Antarctic, with webbed feet and wings like flippers that are used for swimming.

hippopotamus

n.

Massive thick-skinned herbivorous animal living in or around rivers of tropical Africa.

From Greek hippopotamos: hippos (horse) + potamos (river).

Short form: hippo

zebra

n.

African wild animal of the horse family with a body covered by black (or dark brown) and white stripes.