Video: Zoo: Giant panda showing 'nesting behaviour' Giant pandas are one of the world's most endangered species. Their natural home lies in a few mountain ranges in central China. There are about 1,600 known to be living in the wild and some 300 in captivity, mostly in China. It is notoriously tricky to tell whether a female panda is expecting a cub because the species is prone to "pseudo pregnancies" where the signs are very similar. Tian Tian has been displaying nesting behaviour, but that is not conclusive. The zoo said that in addition to monitoring Tian Tian's hormone levels, the panda team were also employing and seeking to refine cutting edge acute protein analysis techniques pioneered by Memphis Zoo in the United States. The results seemed to suggest the profile of a pregnant panda that will carry to full term, Edinburgh Zoo said.