Sexual dimorphism II
Examples of differences in the appearance of males and females of the same species of arthropods, birds and mammals (compare on successive photos).
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Uca tangeri
West African fiddler crab
Male.
Portugal, distrito de Faro, Alvor.
9/16/2017
IE016'08-170916096'JJK
The genus Uca shows strong sexual dimorphism manifested by extensive development of one of male's claws. Large claw, that represents almost a half of body weight, is used for territorial fighting and for a waving display.