Angry Hippo

Hippopotamuses seem like quiet retiring creatures who like nothing more than relaxing in mud and then having endless baths. In fact, they're one of the greatest man killers on the animal kingdom, second only to lions in their ferocity. Their canine teeth average about at about 50 cms long, and they can use their head as a battering ram which (when they're not fighting other males over women and territory) they use to sink boats or attack humans which are getting too close to them or their young. So whatever you do don't ever look at a hippo in the wrong way.