Nautiluses: The Spiral-Shelled Cephalopods

Nautiluses are a type of cephalopod, which is a group of marine animals that also includes squid, octopuses, and cuttlefish. Nautiluses are characterized by their distinctive shells, which are spiral in shape and have chambers that can be filled with water to help the animal regulate its buoyancy.
Nautiluses are found in tropical and subtropical waters around the world, and they typically live at depths of 100 to 500 meters. They are carnivores and feed on small fish, shrimp, and other invertebrates.
There are six species of nautiluses known to science, and they range in size from about 20 to 30 centimeters (8 to 12 inches) in length. The largest species, Nautilus macromphalus, can grow up to 40 centimeters (16 inches) in length.
Nautiluses have been around for a long time - fossils of nautiluses have been found dating back to the Triassic period, over 200 million years ago. Today, nautiluses are considered an endangered species due to habitat loss and overfishing.