I don't think you can say femail praying mantii (plural for mantis?) or black windows who kill their mates after mating can be considered evil b/c they are doing what their instincts tell them to do and they all do it. However reading about chimps that gang up to beat or kill another chimp or animals who kill for pleasure could be evil. I read somewhere that there are actually very few animals who kill for pleasure....i should find that story.