A tree of Chinese avian subregions based on a 2007 dataset comprised of the distributions of 105 endemic bird species in 18 subregions. The avian subregional codes are: A00 = the hypothetical outgroup, A01 = Da Xinganling Mountain Subregion (DXMS), A02 = Changbai Mt. Subregion (CMS), A03 = Song-Liao Plain Subregion (SLPS), A04 = Huang-Huai Plain Subregion (HHPS), A05 = Loess Plateau Subregion (LPS), A06 = East Meadow Subregion (EMS), A07 = West Desert Subregion (WDS), A08 = Tianshan Hilly Subregion (THS), A09 = Qiangtang Plateau Subregion (QPS), A10 = Qinghai-Zangnan Subregion (QZS), A11 = Southwest Mountainous Subregion (SMS), A12 = Southeast Himalayan Slope (SHSS) Subregion, A13 = Eastern Hillock-Plain Subregion (EHPS), A14 = Western Mountainous Plateau Subregion (WMPS), A15 = Min-Guang Coastal Subregion (MGCS), A16 = Southern Yunnan Hilly Subregion (SYHS), A17 = Hainan Subregion (HS), A18 = Taiwan Subregion (TS).