![Greenland shark or Greenland sleeper shark, Somniosus microcephalus and divers, St. Lawrence River estuary, Canada, (shark was wild & unrestrained )](https://cdn.mos.cms.futurecdn.net/YXM4M8KFaJF5b27QPsVB3n-320-80.jpg)
Secret of why Greenland sharks live so incredibly long finally revealed
Surprising new research has revealed why the world's longest-living vertebrate, the Greenland shark, has such a lengthy lifespan. The findings could have big implications for the species' future.