S1, E1: How have the many extraordinary creatures of Galapagos developed to deal with life on this restless Pacific outpost? This astonishing wildlife documentary watches marine iguanas, the world’s only seagoing lizards, leaping off lava cliffs into treacherous surf. Galapagos giant tortoises are seen being groomed by Darwin's finches, while the magical courtship display of the albatross is revealed.