The second hour delves deeper into these islands and what makes them a vibrant crucible of life. Follow Darwin?s legendary exploration as he journeys from island to island observing how nature evolves and adapts to survive. From finches to mockingbirds, explore the living laboratory of evolution that inspired Darwin, offering him additional clues as he unraveled one of nature?s greatest riddles and arrived at his theory of natural selection. And see for yourself the variations in the islands? most famous occupants, the tortoises, from those with dome-shaped shells found at higher elevations to those with saddle-shaped shells found at lower elevations.