La specia de crab „Uca pugnax”, masculii au un cleşte mult mai dezvoltat faţă de celălalt, iar acesta este folosit în luptă, pe când femelele au doar cleşti mici pe care îi utilizează pentru a se hrăni.
Patricia Jennings, autoarea studiului publicat în revista „Biology Letters”, consideră că „sexul ocazional este un fel de plată pentru protecţia oferită de masculi. Acesta este rapid, durează un minut sau două şi apoi toată lumea se retrage în bârlogul lui”.
Femelele sunt mult mai pretenţioase atunci când este sezonul de împerechere: alegerea partenerului depinde de calitatea vizuinei lui, unde se va face sex pentru o perioadă îndelungată.
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