What’s behind a chimpanzee 'civil war'?

 Scientists spent decades watching a large group of chimpanzees in Uganda, living peacefully together. Until 2015, when suddenly things started falling apart. And within a few years, two rival factions were launching violent attacks against one another, resulting in a permanent rift. Aaron Sandel is a primatologist at the University of Texas at Austin, he explains why the violence may have erupted, and what we humans can learn from it, about social breakdown.