Ussuriisk is well-known for its unique biodiversity. In this juncture between northern boreal and southern subtropical forest ecosystems, tropical plants and northern coniferous trees are found wrapped around each other in perfect symbiosis. There are approximately 70 species of mammals, over 250 species of birds and a great number of invertebrates. Here, the border between two natural zones - coniferous and coniferous-broad-leaved forests - and occurrence limits of many species of animals and plants run.The Bikin has 241 resident bird species and valley broad leaf deciduous and wetland larch forests exhibit the most diverse range of nesting bird species composition in the region