Features
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Airs Sunday, March 13, 2011 at 8:00 p.m. ET. Check your local listings.
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A Murder of Crows Preview
New research has shown that crows are among the most intelligent animals in the world.
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Animals congregate in huge colonies partly out of necessity and partly for the security.
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American Eagle
In the 1960s, the bald eagle became an emblem of environmental degradation.