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Airs Wednesday, April 11, 2012 at 8:00 p.m. ET/PT. Check your local listings.
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Airs Wednesday, April 4, 2012 at 8:00 p.m. ET/PT. Check your local listings.
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Airs Wednesday, August 20, 2014 at 8:00 p.m. ET/PT. Check your local listings.
1:27
An extended preview for "Salmon: Running the Gauntlet" which premieres 5/1/2011.
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Airs Wednesday, July 2, 2014 at 8:00 p.m. ET/PT. Check your local listings.
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Airs Wednesday, March 21, 2012 at 8:00 p.m. ET/PT. Check your local listings.
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Airs Wednesday, March 12, 2014 at 8:00 p.m. ET/PT. Check your local listings.
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Where 100,000 pelicans flock to following a rare environmental event.
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Airs Wednesday, January 18, 2012 at 8:00 p.m. ET/PT. Check your local listings.
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Airs Wednesday, January 2, 2013 at 8:00 p.m. ET/PT. Check your local listings.
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The Himalayan mountain system is the planet's highest.
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Airs Wednesday, August 21, 2013 at 8:00 p.m. ET/PT. Check your local listings.
