"Through surveillance we found out that Xiang Xiang had gradually adapted to the wild environment," said Zhang Hemin, director of the Wolong Giant Panda Protection and Research Centre.

"We have also detected other wild pandas in the area, which means Xiang Xiang is being integrated into a wild population," Zhang told CCTV state television.

Researchers fitted a global positioning system (GPS) device around the animal's neck to monitor his activities, CCTV said.

They would study his choice of territory, his meals and waste, but would strictly avoid direct contact so as to help him completely shake off dependence on humans, the report said.

The giant panda is one of the world's most endangered and exotic species and is found only in China. An estimated 1,500 wild pandas live in Sichuan, Gansu and Shaanxi provinces.

State media said China had also raised about 180 giant pandas in captive breeding programmes and spent US$12.5 million since 2003 training them for release into the wild. Some experts, though, are guarded about their prospects, citing a number of unknowns.