The pygmy hippopotamus looks a lot like like its full sized cousin.
The pygmy hippopotamus resembles the common hippopotamus in other ways as well, for example it is also semi-aquatic.
On the other hand the pygmy hippopotamus is a lot smaller than the common hippopotamus, about the size of a really large domestic pig. Unlike its cousin, the pygmy hippopotamus is not a bloodthirsty maniac and they try not to fight each other.
Pygmy hippopotamus on Wikipedia.
Pygmy hippopotamus on the Toronto Zoo website.