American Lobster (Homarus americanus), also known as Lobster; weight – up to 20 kg (44 lb); lifespan – very long. American Lobster is a crustacean with a large shrimp-like body and 10 legs, two of which are large, strong claws. One claw is a big-toothed crusher claw for pulverizing shells, and the other is a finer-edged ripper claw, resembling a steak knife, for tearing soft flesh. Most lobsters are either olive-green or greenish-brown. Some have orange, reddish, dark green, or black speckles and bluish colors in the joints of their appendages. Lobsters are opportunistic feeders, feeding on whatever prey is most available, so their diet varies regionally. Adults are omnivorous, feeding on crabs, mollusks, worms, sea urchins, sea stars, fish, and macroalgae. Image courtesy of NOAA.