剧情： The Equator is known in science as the "cradle of life" - because all species first arose here – and as the "museum of life" because rarely do creatures here go extinct. It holds the greatest biodiversity on Earth. In this episode we meet lowland gorillas in the African country of Gabon and orangutans in Indonesia, as well as travel to Galapagos Islands to learn how tourism is altering the evolution of Darwin’s finches.