It's possible that as many as two hundred thousand gray wolves once thrived across the United States. But human settlements expanded and the species was viewed as a threat to livestock, and wolves were gradually eliminated from most of their original territory. But in 1995, the U.S. Fish and Wildlife service began a bold movement to capture wild wolves in Canada and reintroduce this formidable predator back into the backcountry of Yellowstone National Park. Although winter in Yellowstone is a harsh season, wolves remain active. They have two layers of hair ? course on the outer and a silky layer closest to their skin ? that help them stay warm on even the chilliest, snowiest days. Wolves live, travel, hunt and raise young in organized groups called packs. A dominant pair ? an alpha male and female ? are the primary breeders and lead the unit. They will move up to a hundred miles per day in search of prey or territory. Rarely does a person observe the complexities of a wolf pack from the inside, but naturalist Casey Anderson tracked the silver pack in Yellowstone's backcountry to learn more about this fascinating species.....

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