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In many sexual dimorphism birds, males have extravagant ornaments and display bright plumage, while females only display drab plumage. This is a result of hormonal mechanisms. However, in some birds, females display male-like plumage or brilliant plumage. Based on the collected data, female bright plumage may be selected by natural selection to win in female-female competition but not by sexual selection to increase reproductive success in some bird species.
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