Science s Why it's so difficult to get pandas to mate

A newly published study of eight male pandas in China describes changes in their physiology as they prepare to mate. The peak panda breeding period lasts just over three weeks in spring, with each female's interest in sex lasting just 24 to 72 hours.

REUTERS/David Moir

Maybe Tian Tian has a headache. Or maybe Yang Guang just isn't that into her. 

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