- any of several large, slender African monkeys of the genus Colobus, lacking thumbs and having long silky fur of black and white (C. polykomos), black and reddish-brown (C. badius), or olive (C. verus): now dwindling.
- any leaf-eating arboreal Old World monkey of the genus Colobus, of W and central Africa, having a slender body, long silky fur, long tail, and reduced or absent thumbs