If the grey reef shark, once believed to require constant motion to breathe, can switch its breathing mode and rest, there is undoubtedly more to uncover about other ram-ventilation sharks.

Reef sharks include grey reef, blacktip reef, whitetip reef, nurse and Caribbean reef sharks. "Keeping shark populations healthy, or rebuilding them, is important for maintaining their roles for ...

Larry Garfield of Fontana takes a look at a grey reef shark at the Aquarium of the Pacific. The Aquarium is introducing the sharks at the Molina Animal Care Center on Thursday, November 15, 2018.

For an animal that can never stop swimming (since that's how they get oxygen), the surfing action gives them some much-needed rest. Fakarava is a famous dive site and home to 500 gray reef sharks.

The global shark fin trade is a $400 million industry that kills up to 100 million sharks annually. The new estimations could place the nurse shark, Caribbean reef shark, grey reef shark, whitetip ...

A Grey Reef shark swims in the Indian Ocean near the Maldives on April 20, 2017. Shark populations around the world are hunted for their liver oil, which is used in cosmetics.

More extinction, but reef sharks in particular, with a global average decline of 63% in five main shark species living on coral reefs. Universal Images Group via Getty Images ...