This enthralling BBC series examines "the lengths living beings go to to stay alive," in the words of Sir David Attenborough (Oprah Winfrey narrates the Discovery Channel version). Aided by breathtaking high-definition cinematography, the makers of Planet Earth explore the more colorful strategies the world's creatures employ to procreate, evade predators, and obtain nourishment. Cameras travel though the air, under the water, and right into the faces of insects, like the alien visage of the stalk-eyed fly. Except for "Challenges of Life" and "Hunters and Hunted," each episode covers a different category, such as mammals and birds. Among the more memorable images: three cheetahs move with the relentless rhythm of mobsters, a school of flying fish glides through the air with the grace of ballerinas, and a Jesus Christ lizard skips across the water, like, well, you know.