FILE - In this Dec. 19, 2011 file photo, Mei Xiang, the female giant panda at the Smithsonian's National Zoo in Washington, eats breakfast. Mei Xiang has given birth to a cub following five consecutive pseudopregnancies in as many years. (AP Photo/Susan Walsh)

Associated Press
FILE - In this Dec. 19, 2011 file photo, Mei Xiang, the female giant panda at the Smithsonian's National Zoo in Washington, eats breakfast. Mei Xiang has given birth to a cub following five consecutive pseudopregnancies in as many years.  (AP Photo/Susan Walsh)
FILE - In this Dec. 19, 2011 file photo, Mei Xiang, the female giant panda at the Smithsonian's National Zoo in Washington, eats breakfast. Mei Xiang has given birth to a cub following five consecutive pseudopregnancies in as many years. (AP Photo/Susan Walsh)
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