Avocets swim on Qili Lake in Xuyi county, Jiangsu province, Nov 29, 2015. As winter comes, migratory birds of various kinds arrive at Xuyi to enjoy the comfort brought by the good ecological conditions. Local government has made great effort to repair environmental damage, aiming to build an ecologically-friendly Xuyi. As a result, wetlands around Maoer Lake, Longmiao Lake and Qili Lake have all become habits of many bird species, like swans, wild geese and ruddy shelducks.[Photo/Xinhua]