ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY
Nautilus (Nautilus pompilius). Macrophotograph of the head of a nautilus. The nautilus is a marine mollusc related to octopus, squid and cuttlefish. It is the only cephalopod mollusc to retain a complete shell (bottom right). The nautilus is a nocturnal bottom-feeder, hunting crustaceans and scavenging, often to depths of 500 metres. Prey is drawn under its protective hood (upper centre) by its numerous arms or tentacles (lower left). The eye of the nautilus (upper right) functions like a pin-hole camera. It lacks both lens and cornea, and resolution and sensitivity are poor. The nautilus is found in the warm waters of the Indian and Pacific Oceans.
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