These hardy Old World monkeys display complex social behaviors and can live in troops of several hundred individuals. These monkeys can be found in large populations in Ethiopia, Somalia, Saudi Arabia, and Yemen. Hamadryas baboons are large-bodied monkeys with a strong build and a dog-like muzzle. While the females of this species have hairless black and brown faces, the male hamadryas baboon has a distinctive mantle (mane) of long silvery hair and a bright pink face and backside. Although staring contests and lip-smacking may seem trivial to us, these behaviors have completely different meanings to hamadryas baboons. In fact, staring is considered a threat behavior! Other threat behaviors include exposing canine teeth and head bobbing.