mongolian forests harbour species of trees and shrubs the main forestforming species are larch larix sibirica the dominant tree species in mongolia pine pinus silvestris cedar spruce fir birch aspen poplar elm and willow mongolian fauna consists of mammal species fish species reptile species amphibian species over bird species over insect species and about species of molluscs as for mongolian fauna as many as animal species mammal bird fish and invertebrate are considered globally threatened species are categorized as critically endangered cr species as endangered en and species as vulnerable vu a further fauna species are categorized as nt as dd and as lc