Can the secrets of our past be found in the jungle? And what can it tell us about our future? Accompany researchers in NATURE’s Deep Jungle: The Beast Within as they explore tropical forests for clues about the origins of humans and what our own future might hold. In a bid to understand the genesis of human aggression, primatologist David Watts travels to Uganda’s Kibale National Park to study chimpanzees. In the past, researchers had witnessed these primates hunting, killing, and eating colobus monkeys. Watts, however, made a chilling new discovery that these primates also hunted and murdered their own kind. The theory under investigation is that violence may help chimp groups cement social ties.

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