They depend heavily upon their sense of smell. All their teeth are large compared to human. Females raised in captivity begin mating at 8-9 years of age. Give birth at 10-11 years of age. Wild females mature 3-4 years later.
Twins are rare.
Weight at birth is around 4 lbs. Longevity is around 40 to 45 years. The main threat comes from habitat destruction, particularly commercial logging, hunting for bush meat and commercial exploitation for overseas trade. Some countries they are extinct. They travel sometimes with other communities, and may share overlapping ranges.