According to Guinness World Records, the world's largest lobster is the American claw lobster, which is1.06m long and weighs 20.14kg from the tail to the tip of the claw. It was captured in Nova Scotia, Canada on 1977. Compared with Asian lobster, the biggest difference is that its first step is a pair of big claws, and the claws on both sides are different in size. Clam lobsters are mainly distributed on the North American coast of the Atlantic Ocean. They live in rocks in shallow waters or make holes in the bottom of gravel. They eat fish, other small crustaceans and shellfish, and occasionally eat marine plants. American lobsters have a long life span. It is generally believed that this lobster can live for more than 50 years. However, due to a large number of fishing and eating, it is rare to see long-lived and large individuals now.