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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.

So parental investment is usually far greater in females, and males compete to get access to them.

Sex-role reversal But examples of sex-role reversal – when females compete more intensely than males to obtain mates – are not rare in nature.

Examples include the jacana water birds, New Zealand's kiwi birds, the tinamou birds native to Central and South America and some shorebird species.

The costs associated with the production of (minuscule) sperm cells are lower than those associated to the production of (large) eggs.But, as with almost anything in nature, there are exceptions that commonly prove the evolutionary processes underlying general patterns.Among vertebrates, the females of the spotted hyena (Crocuta crocuta) have developed a pseudo-penis structure.Instead, the way each sex behaves depends on several factors such as asymmetries in parental investment, sex-ratio or the availability of mates.So the next time you see an animal with what seems to be an intromittent sexual organ, don't take for granted it's a male. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission.

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