In a transboundary area named “Amur River Sources” we have organized and annually conduct the monitoring of rare animals such as the dzeren Procapra gutturosa, the Tarbagan marmot Marmota sibirica, cranes, and the great bustard Otis tarda. This area covers a southern part of East Transbaikalia, mostly Kyrinsky District (Russian segment) and a northern part of Khentii and, partly, Dornod aimags of Mongolia. It includes the Sokhondo Nature Reserve with the buffer zone and adjacent areas of the Mongolian “Onon-Balj” National Park.