Greenland sharks are carnivorous and opportunistic feeders. Their diet includes cod, haddock, halibut, salmon, Arctic char, sculpins, flounders, lumpfish, seals, porpoises, and even other sharks. Because they are slow-moving and live in deep, cold waters, they likely scavenge and ambush prey rather than actively hunt. They rely on smell rather than eyesight and can enter dormancy when food is scarce.