Cooler than normal sea-surface temperatures due to the La Nina phenomenon may be partly responsible for a spate of fatal shark attacks off Mexico’s Pacific coast, a U.S. shark expert has said. La Nina, which usually results in cooler than normal water in the Pacific, has moved the boundary between cold and warm water closer to the shore, and along with it, fish and their shark predators, George Burgess, director of the Florida Program for Shark Research told Reuters.

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