water snake
['submarine, pigboat, sub, U-boat', 'hippopotamus, hippo, river horse, Hippopotamus amphibius', 'mud turtle', 'tailed frog, bell toad, ribbed toad, tailed toad, Ascaphus trui', 'sandbar, sand bar', 'chiton, coat-of-mail shell, sea cradle, polyplacophore', 'limpkin, Aramus pictus']