Hammerhead sharks 'hold their breath' in deeper, colder waters, research shows

Hammerhead sharks 'hold their breath' in deeper, colder waters, research shows

Scalloped hammerhead sharks can dive to depths of more than 2,600 ft (800 m) to hunt for squid and other food. Gerard Soury/Getty Images Sharks are among the best swimmers on the planet, but new re… [+3656 chars]

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