Avsnitt 6

A titanic collision between India and Asia created the tallest mountain range on earth and forced up the vast Tibetan plateau -- often described as "The Roof of the World." Only those creatures that could adapt to hostile alpine conditions survived in the highest ecosystems on Earth . Mutation and evolution combined to create a cast of rugged mountaineers with unique anatomy and behaviour that enables them to thrive at the very limits of life on our planet.