The large stomach and intestines of these monkeys give them a potbellied appearance. Otherwise, langurs have a slender body, with a long tail. Their coat may be red, brown, silver, gray, golden, or black. Males are larger than females.
Langurs live in habitats ranging from warm, humid swamp forests to cold mountain areas.
Almost all species live mainly in trees. A few species may spend much of their time on the ground. Langurs live in groups that typically consist of from 10 to 40 members. Adult female langurs mate about once every two years. A pregnant female carries her young inside her body from 150 to 220 days, depending on the species.