The Chambered Nautilus, also called Pearly Nautilus, dwells in the Indo-Pacific region. Mostly found deep - up to 1640 feet - it ascends at night. 

This creature reaches 8 inches in length, sporting a smooth shell with a brown and white pattern. The shell curves above the nautilus, creating around 30 chambers for growth. It resides in the outermost chamber and has a central tube that allows buoyancy control.

Its eyes are rudimentary, lacking lenses and functioning like a pinhole camera. Instead, the nautilus relies on a keen sense of smell to catch fish and crabs, its main prey. Furthermore, it consumes carrion when necessary.