Synchronized urination may reinforce social bonds and improve group cohesion among chimps, according to new research.

The chimpanzees in the next territory over seem ... Brownface soon emerged 100 feet away, a small deer hanging limply from his mouth. The baboons had killed it and Brownface had stolen it.

As they stepped, their feet fell close together. Like humans today, they maintained good balance because their center of gravity moved forward in a straight line. By contrast, when a chimpanzee ...

Distance also mattered: animals within just a few feet of the first chimp to go were much more likely to follow suit than chimps located 10 or more feet away. “I initially expected that if ...