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male swordtail fishes.
Males of many species have striking and beautiful ornamentation, which are, aside from helping find female mates, otherwise impractical. Scientists mapped these ornaments genetic bases in fish.
Nature has innumerable examples of ornaments from mostly the males of various species. Such examples include peacock tail feathers, male rhinoceros beetle horns, and deer antlers.
Superficially, these may be disadvantages because they make their owners easily detectable by predators. Colorful plumage makes them conspicuous, and large antlers hinder a quick escape in forests. This made male ornamental evolution fascinating to scientists.
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Charles Darwin speculated on the evolutionary uses of these energy-intensive, exaggerated, and harmful features. He demonstrated his idea of sexual selection in swordtail fish (scientific name
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