King crabs are large crustaceans found primarily in the cold waters of the Bering Sea and North Pacific Ocean. They belong to the family Lithodidae and are known for their long legs and hard shells. The most common species is the red king crab, which can weigh up to 24 pounds and have a leg span of over 5 feet. These crabs are popular in seafood cuisine, especially in dishes like crab legs and crab cakes. They are typically harvested during the winter months, and their fishing is regulated to ensure sustainable populations. King crabs are also an important part of the marine ecosystem, serving as both predators and prey.