"Snow Monkeys" producer and cinematographer Joe Pontecorvo sought to capture the life of Japanese Macaques deep within the snow-covered mountains of Northern Japan, in a valley named Jigokudani, meaning "Hell Valley". Pontecorvo and his wife Nimmida Pontecorvo followed an individual snow monkey troop of over 160 members for over a year to truly get to know these fascinating creatures. Go behind the scenes with Nature on PBS to discover how these incredible moments were captured and presented. For more, visit http://www.pbs.org/wnet/nature