Nautilus pompilius is a marine cephalopod belonging to the family Nautilidae. It is known for its distinctive coiled shell, which is divided into chambers. This shell helps the animal regulate buoyancy in the water, allowing it to float and navigate effectively. Nautilus pompilius is often referred to as a "living fossil" because it has changed little over millions of years. These creatures inhabit the warm waters of the Indo-Pacific region, typically at depths of 200 to 800 meters. They primarily feed on small fish, crustaceans, and other marine organisms. Nautilus pompilius plays a crucial role in the marine ecosystem, serving as both predator and prey.