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How Nature Works
7 p.m. Friday, Nat Geo
A look at the symbiotic relationships between plants and animals including how East African giraffes eat around termites, thus making homes for geckos. Or the agouti (pictured in the Tambopata Research Centre, Amazonian, Peru), virtually the only animal with teeth strong enough to open the thick husk of Brazil nuts. The angouti will store and transport nuts through the forest floor, thus ensuring the survival of the Brazil nut tree.
Friday season finales: "Nikita," 7 p.m. CW; "Undercover Boss: Epic Bosses," 7 p.m. CBS; "Shark Tank," 8 p.m. ABC
May 14, 2013