Slightly OT, but interesting (http://www.theaustralian.news.com.au/story/0,20867,21277955-2703,00.html)
The use of spears and axes to hunt and kill is commonly thought to have been pioneered among humanity's ancestors by males, but research has indicated weapons may have been a female invention that compensated for their lesser size and strength.
Anthropologists' observations of chimpanzees in Senegal have revealed they gnaw the ends of sticks to create rudimentary spears, which they use to hunt bushbabies, a small primate.
The findings are the first evidence of the systematic use of weapons in a species other than humans - and they are intriguing because all but one of the chimps using the spears were females or immature males.
This gender imbalance has led scientists to theorise that female chimps pioneered hunting with weapons as the only way in which they could compete with the physically stronger males to add animal protein to their diets. While males can hunt with their bare hands, females need weapons to help them.