Of the 465 shark species that exist in the world, only eight have been reported in arctic waters. Perhaps the most fascinating of these is the Greenland Shark. Also known as the sleeper shark, this slow-moving giant lives in arctic waters year-round, lurking in depths up to 1,800 feet (550 metres) in summer and moving into shallower waters in winter months.

Noted for its slow, deliberate movements, the Greenland Shark is believed to lure its prey close by taking advantage of bioluminescent parasites that live in its eyes. These glowing eyes may well be the shark's most striking feature.