Children travelling with their parents or relatives wait to board a train at a railway station in Jiujiang, East China's Jiangxi province, June 28, 2017. During summer vacation, many children from rural areas migrate to cities where their parents work, or leave cities for their hometowns because their parents have no time to look after them. The group has a special name, "Little Migratory Birds", meaning they move between places during summer or winter vacations.[Photo/Ecns.cn]