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In the weeks following the worst oil spill in U.S. history, some of the world's most endangered sea turtles the Kemps Ridley begin washing up dead on Mississippi beaches. But strangely, the dead turtles show no sign of oil or the dispersants used to break up the oil. The experts are stumped, and it takes months of detective work to the find the answer. Then, find out why giant catfish are swiping birds from the water's edge in a Spanish city.