Breeding display
Breeding behaviour in birds, reptiles and amphibians.

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Breeding display
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Uca tangeri (Eydoux) West African fiddler crab
Decapoda, Ocypodidae
Males fighting.
Portugal, distrito de Faro, Alvor.
4/22/2019
IE016'12-190422139'JJK
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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.