Three stomachs make up the digestive system, which is within the cephalothorax (the head and thorax). The first stomach (forgut) grinds food into small particles with grinding teeth. The second stomach (midgut) has glands to digest particles. The glands are the green portion of the lobster eaten by some humans (called the "tomalley"). The third stomach (hindgut) receives non-absorbed particles which are passed to the retum and anus.
Homarus americanus does the majority of its eating at night. It is usually a scavenger, feeding on dead animals, but is also capable of capturing its own prey. The lobster's diet consists mostly of clams, crabs, snails, small fish, algae and other plants called eelgrass. Since lobsters sometimes eat their own molted shell they were thought to be cannabalistic, but this has never been recorded in the wild. However, they will eat other lobsters when in captivity.
Animal Foods: fish; carrion ; mollusks; aquatic crustaceans
Plant Foods: algae; macroalgae
Primary Diet: carnivore (Piscivore , Eats non-insect arthropods, Molluscivore , Scavenger ); omnivore