ABSTRACT
Colobines, mostly Asian, are distinguished by digestive specializations for folivory. The descriptions of primate behavior are arranged under these headings: ecology, sociality, and life cycle. One-male troops are typical and rates of social interaction are low. Alloparenting is common, including for very young infants. Gray langurs are widely distributed in Asia and survive in a wide variety of habitats. Other langur species display a variety of distinctive traits. Odd-nosed monkeys tend toward multilevel social organization. African colobines are preyed upon by chimpanzees in addition to the usual range of predators. Black-and-white colobus have been the subject of important studies bearing on the relevance of the Socioecological Model to folivores. Cercopithecines are distinguished by cheek pouches and generally have a more omnivorous diet than colobines. Gray langurs, also called Hanuman langurs, are the most widely distributed genus of Asian colobine. Cercopithecines, the other cercopithecoid subfamily, are characterized by cheek pouches. Cercopithecines are divided into guenons and papionins.
