Manu National Park in Peru's Amazon spans an area half the size of Switzerland, one of the most remote and biologically dense reserves in the world, and this film splits its attention between the wildlife inside it and the people who live there. Three biologists track giant otters, squirrel monkeys, and macaws through the park's rivers and canopy, recording behavior in a habitat largely undisturbed by outside contact. Anthropologist Glenn Shepard lives among the Machiguenga, an Indigenous people with a history of contact reaching back to the Inca Empire, and the film follows his relationship with Mariano, a Machiguenga shaman who walks him through the tribe's understanding of the spirit world underlying the forest. Narrated by Linda Hunt, the film moves between field footage of otters hunting and monkeys foraging and scenes of Machiguenga ritual and daily life, treating both as evidence of how tightly the ecosystem and the culture built around it are bound together. Written by Kim MacQuarrie, it won two Emmy Awards and a Cine Golden Eagle.