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Giant panda Mei Xiang sleeps indoors at Smithsonian's National Zoological Park in Washington, DC, USA, 11 August 2015. Scientists have confirmed a secondary rise in giant panda Mei Xiang's urinary progesterone levels. The rise started 20 July and indicates that she will either have a cub or experience the end of a pseudopregnancy within 30 to 50 days. Mei Xiang was artificially inseminated in late April, with frozen sperm collected from Hui Hui, a panda living in China, and fresh sperm collected from the National Zoo's Tian Tian. (Photo by Michael Reynolds/EPA)
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