Nature: Fortress of the Bears

Travel to Alaska's Admiralty Island as this episode of "Nature" explores the world of its population of brown bears. Employing beautiful nature cinematography, the program reveals how the bears thrive as part of the region's elaborate ecosystem, feasting on the millions of salmon they share with eagles, orcas, and sea lions...until one year, a challenging shortage of food endangers the animals' survival. 60 min. Widescreen (Enhanced); Soundtrack: English.