Photo taken on May 11, 2015 shows three wild wolf pups, one of whom died afterwards, after they were rescued in northwest China's Gansu Province. Local wild animal protection activist Wang Peng and his team released two wolves back to Maqu grassland on Thursday. The two wolves, rescued by Wang Peng's team during a scientific expedition in 2015, underwent a rehabilitation training in the past two years. (Xinhua/Chen Bin)
