This book offers a rare and detailed insight into 20 years' of in-depth field research and conservation of the white-headed langur. It focuses on the white-headed langur's natural refuge, territory and home range, diets and foraging strategies, behavior modes, reproductive strategies, population, possible future viabilities, and their interaction with human society. From 1996 through 2016, a small research team led by Prof.Wenshi Pan from Peking University conducted studies and conservation efforts on the white-headed langur, one of the most endangered endemic species of China, in Guangxi and saved the species from extinction. With the help of conservationists' efforts, the white-headed langur population in Nongguan Mountains, Guangxi, gradually increased from 105 to approximately 820.This book shares the success story of the unification of human development and wildlife conservation.