Lobsters are invertebrates and have a hard protective exoskeleton.
Lobsters live on rocky, sandy, or muddy bottoms from the shoreline to beyond the edge of the continental shelf. They generally live singly in crevices or in burrows under rocks.
Lobsters typically eat live food, consisting of fish, mollusks, other crustaceans, worms, and some plant life. Occasionally, they will scavenge if necessary, and may resort to cannibalism in captivity; however, this has not been observed in the wild. Lobsters grow throughout their lives and it is not unusual for a lobster to live for more than 100 years. They can reach impressive sizes and according to the Guinness World Records, the largest lobster was caught in Nova Scotia, Canada, and weighed 20.14 kg (44.4 lb).