Walking With Giants, The Grizzlies of Siberia - Who says that given the chance, a ten-foot-tall, 1500-pound grizzly bear would tear you limb from limb? Certainly not naturalists Charlie Russell and Maureen Enns. They contend that this growing predator is an intelligent social animal that isn't instinctively hostile to human beings. To prove their point, they go to Siberia's Kamchatka Peninsula to live with a group of grizzlies that have never been with people before. Unexpectedly, they become foster parents to three orphaned cubs, hoping to fatten them up and teach them the skills they need to survive in this bear-bite-bear world.