Hammerhead sharks 'hold their breath' in deeper, colder wate

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

Sharks are ectotherms and their internal body temperatures usually reflect the waters they swim in. Holding their breath helps them function in the frigid deep.

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Australia , Australian , Mark Meekan , Mark Royer , Adrian Gleiss , , Hawaii Institute , Marine Biology ,