We've all had to deal with breakups — with close friends or romantic partners. But breakups aren't a uniquely human phenomenon. Our primate cousins do it too.
Robert Seyfarth, a primatologist at the University of Pennsylvania, says there are a number of ways a breakup can go down in a group of primates.
"We have known for years that primate groups, like baboons and other African monkeys and chimpanzees and gorillas, that they grow in size. And at a certain point, they may split apart," Seyfarth said.