Usually thought of as a living fossil, the Chambered Nautilus (Nautilus pompilius) has been on the earth much longer than any fish. A relative of the squid and octopus, the Chambered Nautilus uses jet propulsion to zip around the ocean at high speeds (although backwards). Unlike the other cephalopods, She lives in a shell, and has up to ninety tentacles. Moreover, the Chambered Nautilus can live to be twenty years old, an unusually long life-span for a cephalopod. (Most only have life spans of three to five years.)
Living in the depths of the sea, the Chambered Nautilus migrates nightly up the water’s surface. At night, She hunts along the coral reefs. Exploring with her beak, the Chambered Nautilus will find a tasty crab, fish, or shrimp to feast on.
...
