1/23/2013

Analysis of an ancient bird's remains discovered in northeastern China revealed that it was an ovulating female, according to findings published in the journal Nature Communications. Researchers were able to identify a medullary bone -- tissue unique in female birds actively reproducing -- allowing the scientists to succinctly conclude the gender of the 125-million-year-old creature. Researchers have unearthed hundreds of fossils of the extinct Confuciusornis sanctus, but until recently were unable to identify the birds' genders.

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