Loud calls from the males.......
The groups consist of up to four adult males and many adult females. Young of varying ages also are incorporated in the group. The number of monkeys in a group can range from thirty to fifty individuals. The monkeys are very social animals, and can often be observed playing and grooming during the rest periods between meals.
Feeding is also a group activity.
It begins to feed in the morning, and are more active during the cooler parts of the day.
Loud calls from males indicate the group is ready to move to another tree to feed. This monkey usually eat leaves, leaf shoots, seeds, flowers, and unripe fruit. It is one of the few species that do not eat ripe fruits; it has a four-chambered stomach, which cannot digest the sugars contained in the fruits. It also consumes charcoal, which is believed to aid their digestion of the toxins in the leaves.
The Zanzibar Red Colobus prefers drier areas over wet ones, such as coastal thickets and coastal rag scrub, but can also be found in agricultural areas and in mangrove swamps. When found in agricultural areas, the monkeys are more used to humans and come closer to the ground.PHYSICAL DESCRIPTION: Male Ht. 2 ft., Wt. 20 lbs. Female Ht. 1.7 ft., Wt. 13 lbs. Coat: Crown and back are dark gray, pubic area white, rest of body orange. Longevity: about 15 years in wild (?).