Overview: Natural-history series exploring the Galapagos Islands, where the forces of nature can be brutal. It's a land of fire, astride the equator, and at the mercy of the elements. This concluding episode reveals how, through time and isolation, animals and plants have evolved the most surprising ways to cope with the profound geological and climatic forces. In the new millennium, with a growing interest in this delicate microcosm of our planet, come ever-increasing challenges.