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Two species of sea urchins from the icy waters of Antarctica protect their young from the harsh conditions outside their bodies for several months before 'giving birth', according to biologists in France. The young develop in womb-like pouches inside the test, or shell, of the female urchin until they are about four millimetres long and fully armed with spines. Other species of sea urchins simply release millions of gametes into the water, and the resulting larvae must fend for themselves.

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