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Hammerhead Sharks of All Sizes Evolved from Single Large Ancestor


May 18, 2010

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The ancestor of all hammerhead sharks probably appeared abruptly in Earth's oceans about 20 million years ago and was as big as some contemporary hammerheads, according to a new study led by the University of Colorado at Boulder. But once the hammerhead evolved, it underwent divergent evolution in different directions, with some species becoming larger, some smaller, and the distinctive hammer-like head of the fish changing in size and shape.Full Story

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University of Colorado at Boulder

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