<正> In December 2002, the State Postal Bureau issued a set of four special stamps featuring gibbons.There are nine species of gibbon, mainly distributed through Southeast Asia. China's Yunnan and Hainan provinces, and Guangxi Zhuang Autonomous Region are home to four of these species. This 0.4-0.6-meter-tall primate's most distinguishing feature is its unusually long forelimbs. It lives in groups, in tropical rain forests and subtropi-