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This short-faced bear was twice the size of a grizzly and could outrun a horse. It roamed North America for a million years, then went extinct. Why?
First Air Date : Aug 19, 2007
Last Air date : Oct 12, 2009
Episode : 7 Episode
Season : 1 Season
Runtime: 60:14 minutes
Studio: National Geographic
Country: United States of America
Cast:
Crew:
