Also known as the Grey Shark, Greenland Sharks are massive and spend most of their time in the icy darkness, relying on their sense of smell to locate food on the sea floor. Sharkfest continues tonight on National Geographic! | National Geographic TV

Researchers in the Arctic have identified a Greenland shark estimated to be about 392 years old, making it one of the oldest living vertebrates ever documented. Greenland sharks grow at an exceptionally slow rate, increasing in length by roughly one centimeter per year, a factor believed to contribute to their extraordinary lifespan. Based on radiocarbon dating of eye tissue, this particular female is thought to have been born in the early 1600s—centuries before most major events of modern histo

Scientists have discovered a female Greenland shark that lived to be an estimated 400 years old. Likely born in the 17th century, the shark, who died recently, was older than the United States. Her secret to longevity? A take it easy lifestyle, natural anti-freeze in her blood and poisonous flesh. Check out this amazing video footage to learn more. #shark #sharks #sharkweek #underwaterworld #greenlandshark #greenlandsharks | Center for Biological Diversity