On the rocks


RARE outcrops of bare rock in the ocean depths provide a valuable nursery for deep-sea octopuses, marine biologists have found. Janet Voight of the Field Museum of Natural History, Chicago, and Anthony Grehan of the National University of Ireland, Galway, studied the octopuses Graneledone and Benthoctopus at an outcrop 2600 metres down in the North Pacific. Female octopuses glued their eggs to the rock face and kept watch over them while they developed (The Biological Bulletin, vol 198,
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