Chengdu Research Base of Giant Panda Breeding The Chengdu Research Base of Giant Panda Breeding in Chengdu is located about 10km from the Chengdu downtown area; the Research Base was built to imitate the wild ecological environment of pandas. It covers 600 acres in area with a green coverage of 96 percent. The base created a perfect ecological environment for the living and breeding of pandas and other precious and rare wild animals. It breeds 23 pandas and lesser pandas, which is about one-third of the entire captive giant panda population in the world. Most of the giant pandas at the Base stay individually in the captive cages, which are in fact large enclosures, each consists of an in-door room and an out-door courtyard. The semi-nature enclosures are very large wild areas but protected by border fences. Those giant pandas that will soon be released back to the wild will be put in the semi-nature enclosures for a long enough period of time for them to adapt to the natural environment. The Research Base also houses black-necked cranes, white storks, 14 species of bamboo, and 300 other plant species. Ninety species of birds also inhabit the area.