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IMAGE: In several species of the genus Xiphophorus, the males carry a so-called sword . Females prefer to mate with males that carry a long sword. view more
Credit: Georg Schneider / Uni Würzburg
The tail feathers of the peacock, the enormous horn of male rhinoceros beetles, the protruding antlers of some deer: In nature, there are countless examples of features which at first sight may only have disadvantages for their owners. After all, it is more difficult to hide from a predator when one is wearing a colourful plumage, and large antlers do not make escaping in the forest any easier. As a rule, it is the male that has such characteristics.