If you're looking for a criminal class in the animal kingdom, look no further than the higher male primate. Gorilla males coolly murder infants fathered by other males to free up nursing mothers for breeding; orangutans will resort to rape if their mating overtures are rebuffed; rival gangs of chimpanzees may wage bloody border wars to protect their turf or enlarge their harems. And the evolutionary big brother of all these creatures, the human male, has a rap sheet that's too long to contemplate.
The latest research, however, shows that in one species of great ape, the bonobo, males engage in...
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