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FEEDING! The chambered Nautilus is a mollusk, related to the octopus, squid, clam and snail. A nautilus, along with the cuttlefish, squid, and octopus, are all cephalopods, meaning “head-foot,” so named because the feet (tentacles) are attached to the head. The nautilus is the only cephalopod that has a fully developed shell for protection. The nautilus has more than 90 suckerless tentacles. Grooves and ridges on the tentacles are used to grip prey and deliver food to a crushing, parrot-like beak. NEWS: This fascinating animal is now on the list of protected species. Quite rightly of course. Of all the squid-species the “Chambered Nautilus” is the only one with a beautiful outer shell. This shell is used for jewelry which is a popular souvenir for tourists. The Nautilus lives at great depth (200 m) but must go to the surface to eat. This makes it extremely vulnerable to its main predator: humans.