You could make a very good case for humans being both better and worse behaved than animals. That's because humans have a greater measure of free will and independent thought, which makes them score higher at both ends of the moral divide, if you could call it that. They are, like gods, capable of extraordinary creativity and extraordinary destructiveness. Such are the burdens of higher intelligence.
Rabbits aren't entirely peaceful by any means. The males fight a lot over mating and territory, but their fights do not usually do much physical damage. I'm not too sure about hedgehogs.