Tibetan monkeys (Macaca thibetana) live at Mt. Huangshan in Anhui province, China. They are called "Duanweihou" in Chinese ("Duan" means short, "wei" means tail, and "hou" means monkey). They belong to the genus Macaca, in which Japanese monkeys (Macaca fuscata) are also included. Like Japanese monkeys, Tibetan monkeys live in multi-male multi-female groups. Compared to Japanese monkeys, however, Tibetan monkeys are peculiar in that they engage in some interesting social behaviors that we cannot observe in other monkeys. Originally written and published in Japanese, this translated book introduces the social relationships and behaviors of the Tibetan monkeys.