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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Afruca tangeri
West African fiddler crab
Female.
Portugal, distrito de Faro, Alvor.
4/22/2019
IE016'05-190422138'JJK
The genus Afruca and related genera show 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.