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

02:31
Scalloped hammerhead sharks can dive to depths of more than 2,600 ft (800 m) to hunt for squid and other food. (Getty Images)
Scalloped hammerhead sharks can dive to depths of more than 2,600 ft (800 m) to hunt for squid and other food. (Getty Images)

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