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Examples include the jacana water birds, New Zealand's kiwi birds, the tinamou birds native to Central and South America and some shorebird species.Then, there are sea horses, among whom males get pregnant and carry the offspring during development; amphibians such as some species of frogs of the genus Dendrobates and; mammals such as the African topi antelope (Damaliscus lunatus).In some cases, the evolution of this so-called role reversal comes with stunning adaptations.There are a variety of examples in nature in which males are the caregivers or females compete for access to mates.Although their genitals are female in function, they are male in form.But another remarkable example, which constitutes a huge step towards understanding the selective pressures acting on the sexes, has been recently observed in cave insects of the genus Neotrogla.

Some iconic examples are the extraordinary feathers of the peacock or paradise birds, or the menacing antlers of dominant red deer males.According to Trivers and the Bateman principle, sexual selection is stronger in the sex that allocates fewer resources to parental investment.The costs associated with the production of (minuscule) sperm cells are lower than those associated to the production of (large) eggs.Once a female finds a male, the gynosoma enables prolonged copulation by anchoring her to the male.Don't stereotype Nature provides us with a deluge of common mating patterns, but also with exceptions.

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