Nautilus with sharp beak and curious tentacles

The chambered nautilus, Nautilus pompilius, also called the pearly nautilus, is a very ancient prehistoric creature that still lives in deep water off coral reefs today. This is just about the only video showing its large beak - the hard cutting mouth parts that act like sissors to cut its prey of shrimps, small crustaceans and perhaps other small squid. You can also see right inside its mouth and the rasping mollusk tongue or radula. The only living shelled member of the cephalopods it has been called a ’living fossil’ because of its similarity to extinct Ammonites - both are molluscs with circular and chambered shells. This living Nautilus has about 30 chambers but the Ammonites had 26 or fewer. The chambers are filled with gas so that the Nautilus can keep bouyant and swim with little effort. It rocks as it swims pushing the shell with its large jet propulsion tube, the ’siphuncle’. Even though it has a little eye without a lens, and sees only light and shade, it is very sensitive to light