Join filmmaker and naturalist David Attenborough as he reveals the 10 "chosen" creatures that he'd most like to save from extinction. While tigers, pandas and polar bears make headlines, Attenborough's ark would be filled with species that don't always receive the same attention. And meet the people protecting these animals, explore the techniques that researchers have devised to ensure their survival and see the lengths to which conservationists will go to in the struggle to save a species.