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Finicky Fiddler Crabs
Female California fiddler crabs, Uca crenulata, may be the world's most discriminating animal when it comes to choosing her mate. Research biologist Catherine deRivera, from the Aquatic Bioinvasions Research and Policy Institute (a joint Smithsonian Environmental Research Center and Portland State University project), observed the mating activity of hundreds of thousands of California fiddler crabs on mud flats in the ********** River estuary in Chula Vista, CA.
Her study, conducted while a doctoral student at UCLA, found that female Uca crenulata visit 23 males on average and may visit over 100 before selecting a mate. The females pass by the males' burrows while he stands outside waving his large claw to get her attention. Once she chooses a male, one of them will close the entrance to the burrow and they will mate and incubate their eggs. Her decision appears to be based on the size, shape and location of his burrow. In addition, females typically select a male that is similar in size to her.
Dr. deRivera's study is published in the August issue of Animal Behavior.