* Hammerhead sharks 'hold their breath' in deeper, colder waters, research shows NPR
* How Deep-Diving Sharks Stay Warm Will Take Your Breath Away The New York Times
* Hammerhead Sharks 'Hold Their Breath' When Deep Diving Gizmodo
* Breath holding, a new discovered habit of this shark KHON2
* Why some hammerhead sharks seem to 'hold their breath' during dives Science News Magazine
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