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The National Zoo is giving mother nature a hand. Giant pandas Mei Xiang and Tian Tian are ready to breed, but they only have a one- to two-day window.
Mei Xiang gave birth to a cub Sunday night.
The National Zoo is anxiously awaiting the potential arrival of a new panda cub. The tricky part is determining whether or not giant panda Mei Xiang is actually pregnant.