Woods Hole Oceanographic Institution (WHOI) researchers have shown large sharks can spend hours deep in the oceans’ mesopelagic zone, which lies 200 to 1,000 meters (650 to 3,300 feet) below the surface. This region is home to more biomass than any other layer of the ocean, but most of its inhabitants are too tiny to serve as meals for large predators, so why are they spending so much time there?
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