• 有些雌性白頸蜂鳥像雄鳥一樣擁有豔麗多彩的羽毛,而非牠們更常見的棕色,新研究說明這種特徵的好處。PHOTOGRAPH BY JOEL SARTORE, NATIONAL GEOGRAPHIC PHOTO ARK
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  • 有些雌性白頸蜂鳥像雄鳥一樣擁有豔麗多彩的羽毛,而非牠們更常見的棕色,新研究說明這種特徵的好處。PHOTOGRAPH BY JOEL SARTORE, NATIONAL GEOGRAPHIC PHOTO ARK

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