The vervet monkey is a small, black faced monkey with a greenish-olive or silvery-gray body, found in the Mara.
Vervet society is built on complex but stable social groups (called troops) of 10 to 50 individuals—mainly adult females and their immature offspring. There is a strict social hierarchy among troop members; a mother’s social standing predetermines her offspring’s, and even adults in a family must submit to juveniles of families with higher social status. Males transfer troops at least once in their lifetime, beginning at puberty. This is a dangerous process not only because of the predators they may encounter in transit, but also because troops dislike immigrants.
Grooming is important in a monkey’s life. Vervets (as well as most other primates) spend several hours a day removing parasites, dirt or other material from one another’s fur. In the primates’ hierarchy, dominant individuals get the most grooming. The hierarchical system also controls feeding, mating, fighting, friendships and even survival.
Close social bonds with female relatives begin to develop in infancy, relationships thought to endure throughout life. Infants are of great interest to the other monkeys in the troop; subadult females do everything possible to be allowed to groom or hold a new infant.
After a birth, the mother licks the infant clean, bites off the umbilical cord and eats the afterbirth. The newborn has black hair and a pink face; it will be 3 or 4 months before it acquires adult coloration.
The infant spends the first week of life clinging to its mother’s stomach. After about the third week, it begins to move about by itself and attempts to play with other young monkeys. Vervet mothers are proprietary in the treatment of their babies, and some will not allow young or even other adult females to hold or carry them. Others gladly leave their infants in charge of any interested female. Researchers report that usually a female’s close family members will have the most unrestricted access to the babies. As the infants grow, they play not only with monkeys but with other young animals. Young vervets chase one another, wrestle, tumble and play “king-of-the-castle,” taking turns pushing each other off a high perch.
Leaves and young shoots are most important in the vervet diet, but bark, flowers, fruit, bulbs, roots and grass seeds are also consumed. The mainly vegetarian diet is supplemented with insects, grubs, eggs, baby birds and sometimes rodents and hares. Vervets rarely drink water.
Vervet monkeys living near areas inhabited by people can become pests, stealing food and other items and raiding crops. This leads to a heavy annual slaughter by poison, traps and guns. In recent years, they have also been considered as a valuable research animal, making live trapping prevalent as well.
The lifespan of the vervet monkey is 24 years.
