"This Gelada baboon couple is copulating after the male’s victory over the former alpha male. Geladas live in communities that consist of an alpha male, many females and a few weaker males. The dominant male tries to maintain sexual exclusivity with his females by charging at them when they try to mate with another male. Fortunately for him gelada females are quite vocal, making it easy to catch them in the act. But some gelada females are devious. Researchers have observed them keeping mum when they’re with a nondominant male, a strategy that helps them get away with the duplicitous deed."