l Giant pandas are native to the mountain forests of Chinese provinces Sichuan, Shaanxi and Gansu.
l Estimates suggest only between 1,000 and 2,000 giant pandas remain in the wild.
l Tian Tian and Yang Guang are the first to live in the UK for 17 years. They are staying at Edinburgh Zoo for a decade.
l The zoo grows about 15% of the bamboo needed to feed the giant pandas. The rest is imported from Amsterdam.
l Yang Guang goes through 55kg of bamboo a day and Tian Tian around 30kg.
l Female pandas ovulate once a year, giving a window of just 36 hours in which they can get pregnant.
l Normal breeding season for pandas is from mid-April to May.
l Tian Tian was artificially inseminated in April using semen from Yang Guang and frozen semen from Bao Bao, a "genetically important" panda which died in Berlin Zoo last year.
l Gestation period is typically five months and the panda will give birth to one or two cubs.
l Panda cubs are born blind, hairless and unable to move, making them dependent on their mother for survival.
l After six to eight weeks, cubs open their eyes for the first time. They feed on their mother's milk for the first year and start eating bamboo at around six months.
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