Watch Nature Shock online: Episode 3 The Bodiless Bear

Examining evidence that four black bears killed in Yellowstone Park in 1990 were victims of their larger cousins, grizzly bears, who had hitherto shied away from confrontation despite their physical superiority. Although the cases were unrelated, they demonstrated the rise in numbers of one of North America's most fearsome predators, showing the effect of changing habitat and increasing hunger

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