Troop of gelada baboons (Theropithecus gelada) at the bottom of a cliff. This baboon inhabits the grasslands areas of the highlands in Eritrea and Ethiopia. Males lead small troops consisting of females and their offspring. They may merge with other groups in rich feeding grounds. It is the only primate gramnivore (feeding mainly on grasses). Photographed in the Debre Libanos gorge, Ethiopia.