概括
紫喉海蜂鸟的两性变异是由于花形而演变的. 雌性比雄性有更长,更曲的嘴巴,这与特定的花养殖偏好有关.
科学领域:
- 进化生物学是进化的生物学.
- 鸟类学 鸟类学是一门学科.
- 性选择性选择性选择
背景情况:
- 圣卢西亚岛上的紫喉海蜂鸟 (Eulampis jugularis) 在比尔形态上表现出极端的性二态.
- 雌性拥有大约三分之一长的嘴巴,比雄性更曲两倍.
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