Mongolian forests harbour 140 species of trees and shrubs, the main forest-forming 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 138 mammal species, 75 fish species, 21 reptile species, 6 amphibian species, over 500 bird species, over 13,000 insect species and about 30 species of molluscs. As for Mongolian fauna, as many as 41 animal species (11 mammal, 25 bird, 2 fish and 3 invertebrate) are considered globally threatened: 4 species are categorized as Critically Endangered (CR), 12 species as Endangered (EN) and 25 species as Vulnerable (VU). A further 28 fauna species are categorized as NT, 8 as DD and 509 as LC.