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| First Discovery of Fossilized Ovaries in Early Birds |
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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) |
