Greenland Shark

The Greenland Shark is a massive, slow-moving species inhabiting the cold waters of the North Atlantic and Arctic Ocean. It belongs to the sleeper shark family Somniosidae and is renowned for extraordinarily slow growth and the longest known lifespan of any vertebrate, with radiocarbon studies suggesting individuals can live 250-500 years. Adults commonly reach 4-5 meters, rivaling the size of a great white shark, despite an extremely leisurely metabolism and swimming speed. It is currently assessed as Vulnerable due to slow reproduction and historical exploitation, making conservation of remaining populations a priority in Arctic waters.

• Massive, stout, cylindrical body with a short, blunt, rounded snout
• Uniform gray to grayish-brown coloration, sometimes with faint darker blotches
• Very small eyes, frequently infested with parasitic copepods that may impair vision
• Two small dorsal fins of similar size, both lacking spines
• Short, rounded pectoral fins and a low, broad caudal fin Its massive size combined with sluggish movement, small fins, and cold-water range separates it from superficially similar sleeper sharks found in warmer or shallower waters.

Greenland Sharks live in the frigid waters of the North Atlantic and Arctic Ocean, from the Canadian Arctic and Greenland to Iceland, Scandinavia, and occasionally as far south as the Gulf of Mexico in deep, cold layers. They range from near-surface Arctic waters down to depths exceeding 2,000 meters, tolerating some of the coldest ocean temperatures of any large shark. In summer they may be found in shallow polar waters, while in warmer regions they retreat to deep, cold layers year-round. Their tolerance for near-freezing temperatures and extreme depths makes them one of the most cold-adapted large predators in the ocean.

Greenland Sharks are notably slow swimmers, cruising at roughly 1-2 kilometers per hour, yet are effective opportunistic predators and scavengers, likely relying on stealth and ambush rather than pursuit. Diet is broad, including fish, seals, and carrion. Growth is exceptionally slow, around 1 centimeter per year, and sexual maturity is not reached until roughly 150 years of age, contributing to their remarkable longevity. Reproduction is ovoviviparous with large litters, though pupping grounds remain poorly documented. They are largely solitary, deep-dwelling animals rarely observed by humans.