Birds observed in the Orkhon River basin during Aug. 15 through Aug. 26, 2007 were 5,538 individuals in 68 species in total. Dominant species were Corvus dauuricus in 3,009 individuals (54.33%), Passer montanus in 499 individuals (9.01%), Pyrrhocorax pyrrhocorax in 213 individuals (3.85%), Corvus corax in 203 individuals (3.67%), and Milvus migrans in 198 individuals (3.58%) in order from the most dominant. As result of observation by habitat types, it appeared 20 species 541 individuals in residential area, 33 species 362 individuals in forest, 39 species 745 individuals in wetland, 26 species 3,373 individuals in steppe and 24 species 517 individuals in rocky area. From the aspect of species diversity, it showed 2.78 in wetland (highest), 2.72 in forest, 2.40 in residential area 1.82 in rocky area, and 1.00 in steppe.