Sharks, No Evolution Forerunner

Shark Tiger Sharks get a bad rap. With only a cartilaginous skeleton, sharks were once thought to be the primitive evolution forerunner of the fish originating more than 400 million years ago during the Paleozoic Era―yet, somehow surviving unchanged. Sharks suffer as a stereotypical indiscriminate evolution forerunners surviving only to kill with unintelligent deadly instincts.

A new study on the migratory patterns of the tiger shark, Galeocerdo cuvier, published in Nature, however, further dispels these misconceptions. For the first time using satellite-tracking technology, an international research team led by James Lea of the Guy Harvey Research Institute in Florida documents the previously unknown extraordinary long-distance annual movements of the tiger shark between completely different types of environments in the Atlantic Ocean. Tiger sharks prove to be no evolution forerunner of the fish.

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