DOUGLAS FAULKNER / SCIENCE PHOTO LIBRARY DOUGLAS FAULKNER / SCIENCE PHOTO LIBRARY
Nautiluses. Two nautiluses (Nautilus sp.) above a coral reef at night. The nautilus is a marine mollusc related to octopuses and squids. It has a spiral shell divided into many chambers, of which the animal inhabits only the outermost. The rest are filled with gas and fluid. The nautilus can regulate its buoyancy by varying the ratio of gas to fluid in these chambers. The nautilus is a nocturnal bottom-feeder, hunting crustaceans and scavenging. Prey is drawn under its protective hood by its numerous tentacles, and torn apart by its beak. They live only in the warm seas of the Indo-Pacific. Photographed off Bailechesengel Island in the Ngemelis Islands, Palau.
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