While adults are primarily black, with white hair encircling their face and half of their tail, their babies are born with all white hair and a pink face. Infants will change color gradually until they reach adult coloration at age four to six months, eventually growing the distinctive mantle of long white hair from their shoulders and around the edge of their back -- fur that once caused them to be heavily hunted. They have also been hunted as bushmeat. As with so many primate populations, the biggest threat to their survival is hunting, capture for sale and habitat destruction.