Snow leopards are recorded visiting and refreshing a rock scent, enabling them to keep in touch with one another. From a Silent Roar: Searching for the Snow Leopard, the first documentary to capture behavioral details, including mating and hunting, of the ghostly, exquisitely beautiful big cat of the Himalayas. Tune in Sunday, June 17 at 8 p.m. (ET) on PBS (check local listings) to watch the program.
