From the same BBC and Discovery Channel team that brought you "Planet Earth" and "The Blue Planet" comes this remarkable nature series four years in the making, highlighting the struggles of creatures and plants from all over the world as they fight to evolve successfully in an ever-changing world. All 10 episodes of the series-including "Challenges of Life," "Reptiles and Amphibians," "Mammals," "Hunters and Hunted," and "Primates"-are presented in a four-disc set. 9 3/4 hrs. Total. Narrated by David Attenborough.10 episodes on 4 discs. 9 3/4 hrs. Widescreen (Enhanced); Soundtrack: English.