Known as the People of the Forest, orangutans are perhaps the most elusive of the great apes. Found only in Sumatra and Borneo, orangutans are arboreal, spending most of their lives in the high canopy trees of the jungle. Shy, solitary, and highly intelligent, orangutans were studied for 50 years by Birute Galdikas. John Ulferts provides fascinating details of orangutan intelligence, communication, and social structure as he treks through the jungles to photograph them.