Blind, slow and 500 years old
Described by one researcher as looking ‘already dead’, the enigmatic creatures are one of the least understood species on the planet
TL;DR
- New findings indicate Greenland sharks are not blind, possessing functional retinas capable of detecting light and contrast.
- The sharks' eyes withstand parasitic copepods and harsh Arctic conditions.
- Researchers observed Greenland sharks exhibiting greater range of movement and using fins for finely tuned movements.
- Questions are raised about the accuracy of previous lifespan estimations (up to 500 years) due to carbon-dating methodology margins of error.
- Greenland sharks may be global circumnavigators, not just confined to deep, cold northern waters.
- There is significant uncertainty regarding Greenland shark reproduction, with no documented pregnant females since 1950.
- The sharks' ability to survive for so long suggests they are capable predators, potentially ambushing prey.
- The warming Arctic climate's impact on Greenland sharks is uncertain, though they are considered a generalist species.
- The research underscores the extensive knowledge gaps and the tendency to underestimate these animals.