Homarus gammarus, commonly known as the European lobster, is a marine crustacean found in the North Atlantic Ocean. It typically inhabits rocky seabeds and can be recognized by its large claws and long antennae. The species is usually dark blue or greenish-brown, with a lighter underside. This lobster species plays a significant role in marine ecosystems as both predator and prey. Homarus gammarus is also economically important, being a popular seafood choice in many countries. Conservation efforts are in place to manage its populations and ensure sustainable fishing practices.