It has actually been suggested that warfare may have been the principle evolutionary pressure that created the huge gap between the human brain and that of our closest living relatives, the anthropoid apes. Whole groups of hominids with inferior brains could not win wars and were therefore exterminated.
Jane GoodallMost Africans don't get to see these wild animals at all. Once they see and learn about them, they are much more likely to become involved in protecting the environment.
Jane Goodall