Untamed Americas

The series opener features rare footage of newly awakened black bears hunting on the Yellowstone Plateau. Also: male bighorn sheep battle for breeding rights in the Rocky Mountains; puma cubs learn to hunt in the Chilean Andes.

A look at wildlife in the deserts of North and South America. Included: mustangs in the Great Basin; Humboldt penguins in the Atacama Desert; tiger moths in the Chihuahuan Desert; grasshopper mice in the Sonoran Desert.

Exploring the coasts of North, Central and South America. Included: male gentoo penguins perform mating rituals on the Falkland Islands; giant Humboldt squid cannibalize their kin in the Sea of Cortez off the coast of Mexico.

Wildlife in the forests of the Americas is examined. Included: river dolphins, jaguars and caiman crocodiles in the Amazon; Kermode bears in Canada's Great Bear Rainforest.