I've always found Hippopotamus to be surprisingly intimidating. They're large swimming tanks with teeth. 
I think they look cute. They are mostly herbivorous semiaquatic mammals native to sub-Saharan Africa.
I might disagree with cute. Don't they like have loose stool and fling it everywhere with there tails to mark their territory? 
I've never seen them do that but it sounds wild. Their name comes from ancient Greek for "river horse".