Journey deep into the great forests of Earth for a new way of looking at these wild places and the animals that live there. Sanjayan travels into an uncharted area of the Amazon that scientists believe is the most bio-diverse place on Earth. From there he follows unique animal behavior in Alaska's Great Bear Rainforest and then meets the farmers in Portugal's cork forests. Frightening elephant battles are exploding on the edge of the forest in Sumatra; in the Amazon, ancient remains are helping change our perception of how to value the world's great forests.