Feiniao introduction: There are more than 30 kinds of fish in the lake, mainly including carp, crucian carp, catfish and other economic fish. In addition, the lake is also rich in white shrimps. Hulun Lake is also an important bird habitat in northern China and an important passage for bird migration in the eastern interior. In spring and autumn, there are many kinds of migratory birds traveling from north to south. According to preliminary statistics, there are 241 species of birds in 17 orders, 41 families, and 41 families in the Hulun Lake area, accounting for 1/5 of the total number of birds in China. They mainly include swans, geese, ducks, herons, etc., many of which are rare birds. Among them, the red-crowned crane, white crane, black stork, great bustard, golden eagle, etc. are national first-level protected birds. There are 15 species of cranes in the world, and there are 5 species in Hulun Lake Nature Reserve. These are white cranes in the crane family. Red-crowned cranes and white-naped cranes have been listed as endangered species in the world, and this wetland has become an important refuge for them.