National Zoo’s twin pandas are only the 3rd set to be born in a U.S. zoo

http://www.washingtonpost.com/local/national-zoos-giant-panda-mei-xiang-gives-birth-to-two-cubs-hours-apart/2015/08/23/74a71726-49a3-11e5-846d-02792f854297_story.html


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