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First Discovery of Fossilized Ovaries in Early Birds

 

 

Fig.1 One of two enantiornithine with fossilized ovarian follicles from the Early Cretaceous Jehol Group　(Image by ZHOU Zhonghe)

 

Fig.2 Close-up of fossilized ovarian follicles in one of two enantiornithine. (Image by ZHOU Zhonghe)

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