This book introduces us to some of the most impressive species, the case studies for the fascinating variety of these animals. Among them are intelligent orangutans, whose name literally means "forest person", "cultured" Japanese macaques, which enjoy bathing in warm volcanic hot springs; mighty, but usually peaceful gorillas; geladas from the barren grassy regions of the Ethiopian Highlands; and bald uakaris - extensively documented here for the first time - from the swamp forests of the Amazon headwaters.