hippopotamus, hippo, river horse, Hippopotamus amphibius
['wombat', 'chiton, coat-of-mail shell, sea cradle, polyplacophore', 'proboscis monkey, Nasalis larvatus', 'three-toed sloth, ai, Bradypus tridactylus', 'French horn, horn', 'sea slug, nudibranch', 'trilobite']