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America’s National Parks. s01e01. Yellowstone

In Yellowstone National Park, baby season is in full swing, and Casey is prepared for the unpredictable. Vigilant mothers must defend their vulnerable newborns from aggressive predators. As grizzlies devour elk calves, newborn bighorn sheep lambs traverse treacherous cliffs and young bison learn to swim. Casey sets out to find ravenous bears as they emerge from their dens, and witnesses a feathered family drama while introducing an orphaned great horned owl to new siblings.