This volume provides a comprehensive introduction to the biology of some of the rarest and least-known nonhuman primates. Virtually unstudied and unknown until 20 years ago, the doucs and snub-nosed monkeys occupy some of the most remote habitats of eastern Asia and exhibit some of the most unusual adaptations of any nonhuman primates. The volume provides detailed information on these rare Asian primates that should be useful to practitioners of evolutionary biology, field and laboratory primatology, systematics, field ecology and conservation biology.