Cooperation and communication — two hallmarks of human nature — likely arose early in primate evolution.
, experts argue that vocal coordination evolved before humans split from chimpanzees and bonobos. They analyzed cooperative chimp hunts and showed that vocal exchanges facilitate their collective pursuit. The finding, the authors say, could mean that communication and cooperation are at leastChimps work together to capture and eat monkeys. It’s dangerous, energetically taxing and doesn’t guarantee a meal at the end of the day.
The primates barked to coordinate their pursuit. Vocal chimps were more likely to join the hunt, and called to signal their intent. Groups that barked also recruited more teammates, initiated the hunt more quickly and captured prey more rapidly. “Strikingly, following the production of hunting barks, we observed more hunters joining, greater speed in beginning the chase, and a shorter time to make the first capture,” says study co-last author Zarin Machanda in aThe team isn’t sure how the bark works as a call to arms. On one hand, hearing others could rile chimpanzees up, and excited individuals could be more willing to join a chase.
They hope to tease apart these possibilities through future studies, but for now, the findings at hand are profound. Cooperation and communication, it seems, aren’t uniquely human. They probably originated deep in the primate evolutionary tree — at the very least, dating back six million years to the time that chimps and humans shared their last common ancestor.
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