Pacific white-sided dolphins are seen in Chimelong Ocean Kingdom in Zhuhai, south China's Guangdong Province, July 2, 2019. Three pacific white-sided dolphin cubs made their first public appearance on Tuesday in Zhuhai. The three cubs, born in May of 2019, are all male. (Photo/China News Service)
Pacific white-sided dolphins are seen in Chimelong Ocean Kingdom in Zhuhai, south China's Guangdong Province, July 2, 2019. Three pacific white-sided dolphin cubs made their first public appearance on Tuesday in Zhuhai. The three cubs, born in May of 2019, are all male. (Photo/China News Service)
Pacific white-sided dolphins are seen in Chimelong Ocean Kingdom in Zhuhai, south China's Guangdong Province, July 2, 2019. Three pacific white-sided dolphin cubs made their first public appearance on Tuesday in Zhuhai. The three cubs, born in May of 2019, are all male. (Photo/China News Service)
Pacific white-sided dolphins are seen in Chimelong Ocean Kingdom in Zhuhai, south China's Guangdong Province, July 2, 2019. Three pacific white-sided dolphin cubs made their first public appearance on Tuesday in Zhuhai. The three cubs, born in May of 2019, are all male. (Photo/China News Service)
Staff members feed and perform routine health checks to pacific white-sided dolphins in Chimelong Ocean Kingdom in Zhuhai, south China's Guangdong Province, July 2, 2019. Three pacific white-sided dolphin cubs made their first public appearance on Tuesday in Zhuhai. The three cubs, born in May of 2019, are all male. (Photo/China News Service)