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When sex roles get reversed, some females develop a ’penis’ [Phys]

par Frédéric Magné - publié le

In many species, the males develop elaborated sexual traits to attract females and dissuade potential rival males through competition. Some iconic examples are the extraordinary feathers of the peacock or paradise birds, or the menacing antlers of dominant red deer males.
But how is the role of each sex determined in nature ? Why do males generally compete for access to females ?

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