但是我看，这事儿吧还挺值得深入研究。
比如乌鸦，雄大雌小，负责孵蛋的雌性为什么体型更小呢？
难道是因为猛禽啥的不怎么筑巢，所以他们的蛋不像会筑巢的鸟那样，有个碗形的巢方便保温和聚拢，就得靠体型硬盖硬孵？
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