12 August 2016
Vol 353, Issue 6300

About The Cover

Cover image expansion

COVER A Greenland shark (Somniosus microcephalus). These creatures are among the world’s largest carnivorous sharks and are distributed throughout Arctic waters. For decades, the longevity of this slow-growing species has remained a mystery. Using well-established radiocarbon dating techniques applied on Greenland shark eye lens tissue, Nielsen et al. estimate that these animals are the longest-living vertebrates known to date. See page 702.
Photo: © Nick Caloyianis/National Geographic Creative