The zoo adopted a protocol used by the Chinese to swap the twins, allowing Mei to care for one while the other was monitor by the zoo keepers, he said.
Mei Xiang's surviving panda cub is a male, fathered by Tian Tian →
Zoo scientists are concerned Mei Xiang may be infertile, said David Wildt, a senior scientist at the Smithsonian Conservation Biology Institute in Front Royal, Va., which has studied panda breeding with Chinese experts.
National Zoo: Panda watch ends in false pregnancy →
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