How whales, dolphins, seals dive so deep

By Susan Milius, 15:47 PM April 15, 2008

A nerve-racking effort to attach cameras to marine mammals has shown how four species dive the impossible dive.

Previous calculations just hadn't explained how certain champion divers use so little oxygen, notes Terrie M. Williams of the University of California, Santa Cruz. Now, she and seven colleagues report that a 10-year project that fit video cameras onto free-swimming animals has revealed a crucial trick.

The blue whale, bottlenose dolphin, Weddell seal, and elephant seal all cut diving...

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