Aerial photo taken on July 24, 2020 shows a sperm whale in the South China Sea. Chinese scientists spotted and recorded sperm whale groups in the South China Sea on Friday. (Xinhua/Zhang Liyun)

Screenshot from a video clip taken on July 24, 2020 shows a sperm whale in the South China Sea. Chinese scientists spotted and recorded sperm whale groups in the South China Sea on Friday. (Xinhua/Zhang Liyun)

Screenshot from a video clip taken on July 24, 2020 shows sperm whales in the South China Sea. Chinese scientists spotted and recorded sperm whale groups in the South China Sea on Friday. (Xinhua/Zhang Liyun)

Photo taken on July 24, 2020 shows a sperm whale in the South China Sea. Chinese scientists spotted and recorded sperm whale groups in the South China Sea on Friday. (Xinhua/Zhang Liyun)

Screenshot from a video clip taken on July 24, 2020 shows a sperm whale in the South China Sea. Chinese scientists spotted and recorded sperm whale groups in the South China Sea on Friday. (Xinhua/Zhang Liyun)