A diver sets an auditory sense testing apparatus on a sperm whale near a dock in Huizhou Harbor in Huizhou, south China's Guangdong Province, March 14, 2017. (Xinhua/Mao Siqian)
A diver sets an auditory sense testing apparatus on a sperm whale near a dock in Huizhou Harbor in Huizhou, south China's Guangdong Province, March 14, 2017. (Xinhua/Mao Siqian)