Staff members transfer a dolphin at the Harbin Polarland in Harbin, northeast China's Heilongjiang Province, Feb. 27, 2021. (Photo by Zhang Tao/Xinhua)

A dolphin adapts to the new environment in the performance pool after they are transferred to the Harbin Polarland in Harbin, northeast China's Heilongjiang Province, Feb. 27, 2021. (Photo by Zhang Tao/Xinhua)