4. The Best of 'Nature': 25 Years

Lynn Sherr hosts a collection of clips highlighting memorable moments from the program's first 25 years. Also: a tribute to the series' creator and host George Page, who died in 2006. Included: hatchling sea turtles on a Caribbean beach; barnacle goslings in the Arctic; a wildebeest defending her calf from wild dogs on the Serengeti; crocodiles attacking gazelles; chimpanzees saved from medical testing; a reunion of two elephants after 25 years apart.