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来自维基百科,自由的百科全书
大多數鳥在孵卵期間腹部羽毛脫落形成孵卵斑。孵卵斑是由於真皮層加厚,血管增多造成的,有利於腹部熱量的傳導。不同類群的孵卵斑數目在1-3個不等,而同種鳥的孵卵斑數是一致的,因此可以作為判斷親緣關係的依據。[1][2]
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