According to the animal resource in Motuo,Chayu and Milin which locate in the marginal zone of Southeast Tibet,the authors count respectively the number of genera and species of the ma mmals,the birds,the amphibians,the reptiles,the fishes and the spiders in the three counties.The rare species and the endemic species are listed respectively and the characters of the biodiversity are discussed.In addition,the authors also discuss the frangibility of the environment in the regions,and give some suggestions to...