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Rights: © Copyright 2013. University of Waikato. All rights reserved. Published 14 June 2013 Size: 29 KB Referencing Hub media

Male pea crabs need to work out which mussels contain females so they can avoid getting crushed by a closing mussel shell while searching for a mate. It is likely that males detect a pheromone that is released by females who are ready to mate. This chemical signal would guide the male crab to a mussel that contains a female.