The various species are
Like many Old World monkeys, they have pads on their bottoms. These are called ischial callosities. They let the monkeys sleep sitting upright on thin branches, beyond reach of predators, without falling off. In some species, these pads change their colour during the mating period.
These monkeys are active in the
Most species are
Gestation lasts approximately six to seven months. Young are weaned after three to 12 months and are fully mature within three to five years. The life expectancy of some species can be as long as 50 years.