“ The only female giant panda in Britain 1 (believe) to be pregnant, ” Edinburgh Zoo said Thursday. The zoo said, “ Tian Tian is being 2 (close) monitored, but it ’ s unclear 3 she will give birth. It ’ s hard to predict exactly and the panda breeding ( 繁殖 ) season can last until late September. ” Tian Tian and male panda Yang Guang, who are both 14, 4 (arrive) in Edinburgh on a decade-long loan from China in 2011 and are 5 only giant pandas in Britain. Tian Tian, or Sweetie, has been pregnant several 6 (time) before in the U. K. but has never given birth. Giant pandas have difficulty breeding and their pregnancies are very difficult 7 (follow). The animals also experience “ pseudo-pregnancies ( 伪怀孕 ) ” , during 8 their behavior and hormonal ( 生理的 ) changes indicate they are pregnant even when they are not. The zoo ’ s statement came after the Edinburgh Evening Nevus used the Freedom of Information Act to obtain communication between the zoo and Scottish government 9 (show) that Tian Tian had been artificially inseminated and could give birth as early as this week. In a July 25 email, Iain Valentine, panda 10 (direct) at the Royal Zoological Society of Scotland, said he thought Tian Tian was about 30 days away from giving birth .