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The American lobster, Homarus americanus, is one species of lobster found on the Atlantic coast of North America. Within North America, it is also known as the northern lobster, Atlantic lobster or Maine lobster. It thrives in cold, shallow waters where there are many rocks and other places to hide from predators and is both solitary and nocturnal. It feeds on fish, small crustaceans, and mollusks.

5 Pairs of legs according to the Maine Aquarium website.

The American lobster is found as far south as North Carolina, but is famously associated with the colder waters around the Canadian Maritimes, Newfoundland and Labrador, Maine, Massachusetts, Rhode Island and New Hampshire. They commonly range from 8 to 24 in (20 to 61 cm) in length and 1 to 9 lb (0.5 to 4.1 kg) in weight, but have been known to reach lengths of well over 1 yd (1 m) and weigh as much as 44 lb (20 kg) or more, making this the heaviest marine crustacean in the world. An average adult is about 9 in (229 mm) long and weighs 1.5 to 2 lb (680.4 to 907.2 g).

The adult American lobster's main natural predator is the codfish, but other enemies include haddock, certain species of seals, flounder, and other lobsters. Overfishing of cod in the early 20th century has allowed the lobster population to grow enormously.