孵卵斑
来自维基百科,自由的百科全书
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来自维基百科,自由的百科全书
大多数鸟在孵卵期间腹部羽毛脱落形成孵卵斑。孵卵斑是由于真皮層加厚,血管增多造成的,有利于腹部热量的传导。不同类群的孵卵斑数目在1-3个不等,而同种鸟的孵卵斑数是一致的,因此可以作为判断亲缘关系的依据。[1][2]
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