greenland shark swimming, somniosus microcephalus, shark with the longest known lifespan of all vertebrate species

age ageing animal aquatic arctic atlantic attack background big biology creature danger dangerous dark deep diving extinction fish great greenland grey gurry harmless illustration jaws life lifespan marine microcephalus nature north ocean old oldest predator rare scars science scratches sea shark sharks somniosidae somniosus species swim swimming threatened travel underwater vertebrate water wildlife