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41.9 MB (2.1 MB compressed)
4134 x 3543 pixels
35.1 x 30.0 cm ⏐ 13.8 x 11.8 in (300dpi)
ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Nautilus shell (Nautilus sp.). Coloured X-ray of the internal structure of a nautilus shell. The nautilus is a marine mollusc related to the octopus and squid. 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. The nautilus lives only in the warm seas around South- East Asia.
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