Caring for the Young Fighting over mates rarely occurs. There is no distinct breeding season although most mating probably occurs during rainy season. Because a female suckles her infant for over a year, an average of 20 months passes before she gives birth again. Other troop members often handle very young infants. In the first month when the infant still has a pink face, it may be handled three to five times an hour in resting groups.
Infant mortality is high even though the young are carefully tended.
The newborn colobus monkey is covered with white fur, and at about 1 month gradually begins to change color, finally gaining the black and white adult coloration at about 3 months. The infant monkey is carried on the mother's abdomen, where it clings to her fur. As it matures it spends a lot of time playing with its mother and certain other adults and at about 7 months begins playing with other juveniles. The games they play exercise their bodies, and as they get older, these develop into wrestling matches and mock displays. At one time these monkeys were hunted excessively for their beautiful fur, leading to their extermination in some areas.