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Catfish King

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Aquatic ecologist Zeb Hogan shows off a 6-foot-5-inch Wels catfish caught in the Ebro river. This monster fish, capable of swallowing a human whole, is one of several invasive catfish species that are taking over the rivers of Spain.

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Zeb Hogan travels to Spain in search of the invasive Wels catfish -- a monster fish capable of growing more than 8 feet long, eating birds, cats, and, as some legends claim -- even humans! Teaming up with local fishing guides and scientists, Hogan investigates why this voracious predator has flourished in Spain's Ebro River and whether indigenous species have declined as a result.

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