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Biologist Discovers What May Be World's 'Pickiest' Mates California fiddler crabs may be among the world`s pickiest animal when it comes to selecting a mate.A study conducted by a biologist at the University of California, San Diego that appears in the August issue of the journal Animal Behaviour found that females of the species Uca crenulata may check out 100 or more male fiddler crabs and their burrows before finally deciding on a mate.
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