National Geographic Society

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Grizzly Bears, Guanacos, Beetles

Grizzly bears can charge at over 30 miles per hour and bite with enough force to crush a bowling ball.  Their strength and speed is thanks to a 1000 lb. body packed with muscle concentrated in their shoulders, hump and buttocks.

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In the wild badlands of the Americas, there are no rules when it comes to survival. Watch what happens when the New World's most ruthless killers turn against each other and fight tooth and claw against their own kind. From a grizzly bear's audacious robbery gone bad, to a starling defending her home to the death, the contenders range from the massive to the miniature, all fighting to stay alive.