The Napa Lake international wetland has become  one of best overwinter places for migratory birds in Shangri-la of Yunnan  Province.There are 510 Black-necked Cranes stopped at Napa Lake wetland during this winter time,according to data of the 4th National survey of overwintering Cranes .It also becomes a new record since the Napa Lake Wetland builded in 1984.(Cili Zhima)