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Rights: © Copyright 2013. University of Waikato. All rights reserved. Published 14 June 2013 Size: 37 KB Referencing Hub media

A female pea crab inside an opened male mussel. Pea crabs live alone within mussels throughout their adult lives. Female pea crabs never leave their mussel hosts, while males leave only to fertilise the eggs of a female within another mussel.