The Edinburgh Zoo says that there are signs that one of its giant pandas may be pregnant.

The zoo says that nesting behaviour and changes in protein and hormone levels suggest Tian Tian could be expecting a cub or experiencing a phantom pregnancy. If pregnant, Tian Tian should give birth in late August or early September.

Panda pregnancies typically last about five months and result in one or two pink, hairless cubs. Giant pandas have difficulty in breeding, with females fertile for only two or three days a year. The zoo artificially inseminated Tian Tian, or Sweetie, after she was reluctant to mate with male companion Yang Guang, or Sunshine. The two animals arrived from China in 2011 on a 10-year loan, and are the only pandas in Britain.

The Edinburgh Zoo says that there are signs that one of its giant pandas may be pregnant. [Xinhua]

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