The closed signs posted at the Panda exhibit at the National Zoo in Washington the day after it was announced that the Zoo’s female giant panda gave birth to a cub, Monday, Sept. 17, 2012, in Fairfax, Va. Mei Xiang gave birth Sunday at 10:46 p.m., but the zoo staff has yet to see the new cub because Mei Xiang has built a large nest in her den. (AP Photo/Pablo Martinez Monsivais)

Associated Press
The closed signs posted at the Panda exhibit at the National Zoo in Washington the day after it was announced that the Zoo’s female giant panda gave birth to a cub, Monday, Sept. 17, 2012, in Fairfax, Va. Mei Xiang gave birth Sunday at 10:46 p.m., but the zoo staff has yet to see the new cub because Mei Xiang has built a large nest in her den. (AP Photo/Pablo Martinez Monsivais)
The closed signs posted at the Panda exhibit at the National Zoo in Washington the day after it was announced that the Zoo’s female giant panda gave birth to a cub, Monday, Sept. 17, 2012, in Fairfax, Va. Mei Xiang gave birth Sunday at 10:46 p.m., but the zoo staff has yet to see the new cub because Mei Xiang has built a large nest in her den. (AP Photo/Pablo Martinez Monsivais)
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