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 | In this undated photo provided by the San Diego Zoo, giant panda Bai Yun is shown. The giant panda at the San Diego Zoo is pregnant again and expecting her fourth cub sometime in August. The zoo said Tuesday July 31, 2007 that Bai Yun was put on '24-hour birth watch' after officials detected a fetus and fetal heartbeat through ultrasound images July 18. click to open  |  | The San Diego Zoo's giant panda cub, Mei Sheng, holds onto a piece of his birthday cake in San Diego August 19, 2005. The cake was designed by zoo staff specifically with the juvenile panda in mind, with his favorite treats like apples, carrots and bamboo. The zoo has the largest population of pandas outside of mainland China, including Mei Sheng, his father Gao Gao, mother Bai Yun, and his two-week-old sibling. click to open |  | This video framegrab image provided by the San Diego Zoo on Aug. 3, 2005, shows the zoo's female giant panda, Bai Yun, craddling her newborn cub under her chin inside the birthing den, shown inside the yellow square, following a three-hour labor Aug. 2, 2005, in San Diego. The gender of the newborn will not be known for sometime. The San Diego Zoo now has the largest population of giant pandas outside of mainland China, while this birth marks the third giant panda cub to be born in San Diego Zoo history. click to open |
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