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| Description: (a) An example of intrasexual selection. The enlarged claw of the male fiddler crab is used in direct male-to-male competition. In this photograph, a male inside a burrow is extending its claw out of the burrow to prevent another male from entering. (b) An example of intersexual selection. Female peacocks choose males based on the males' colourful long tail feathers and the robustness of their display.
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