
Outsider threats inspire bonding, cooperation among chimpanzees
Feb. 24 (UPI) -- Humans are a social species -- the human success story is in many ways a story of cooperation and collaboration. But from the beginning, as evidenced by prehistoric skull fractures and ancient mass burials, the human story has also been marked -- and marred -- by violence. Advertisement Now, new research suggests the origins of this dichotomy between cooperation and conflict can be traced to our closest relatives, the great apes. In a first-of-its-kind study, published Wednesday in the journal PLOS One, scientists found chimpanzees are more likely to cooperate and form tight in-group bonds after exposure to outsider threats. "The association between in-group cohesion and out-group aggression has long been recognized in humans, but the evolutionary background remains unde...