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September 17, 2012
Pablo Monsivais photo

Dennis Kelly, Director of the National Zoo, during a news conference 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 pm, but the zoo staff has yet to see the new cub because Mei Xiang has built a large nest in her den.

Pablo Monsivais photo

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.

Pablo Monsivais photo

A trio of children climb and lean against the handrail of the closed 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 pm, but the zoo staff has yet to see the new cub because Mei Xiang has built a large nest in her den.

Pablo Monsivais photo

Visitors walk past 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.

Pablo Monsivais photo

Dr. Suzan Murray, right, the Chief Veterinarian at the National Zoo, during a news conference 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. With Murray are from left to right, Pierre Comizzoli, a reproductive physiologist, Brandie Smith, National Zoo Senior Curator, and Dennis Kelly, Dir. of National Zoo.