Territory boundaries are marked by vocalizations, and troops meeting at a boundary jump up and down excitedly for a time. A strong male acts as lead animal, threatening enemies and covering retreats. Besides man, they have leopards and large eagles as predators. When eating they prefer young tender leaves and the troop may stay several days on the same few trees. They can withstand cold temperatures.
Females retreat with a male just prior to giving birth and return shortly thereafter.
Infants are carried on the abdomen with the young clinging to the mother's sides. At one week the young moves freely on the mother's lap and two weeks move about. The mother carries the youngster until the age of 8 months, although the father will play with it and help in its care. He is very patient and never scolds as some other monkeys do.