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A swarm of male white tip sharks attack a single exhausted female shark in one of the most violent courtships in the animal kingdom. From Shark Mountain, airing on the NATURE series, July 29th at 8 p.m. (ET) on PBS (check local listings). The film takes viewers to Cocos Island in the Pacific, where sharks of all kinds converge in staggering numbers.

For more information, visit http://www.pbs.org/nature