Tourists visit a newly-opened freshwater aquarium at the Xishuangbanna Primitive Forest Park in Xishuangbanna, southwest China's Yunnan province on January 5, 2020. As the first of this kind in China, the aquarium is home to native freshwater species from the Mekong River, freshwater fish species from the Yangtze River and other rare amphibians. Photo:Xinhua

Tourists visit a newly-opened freshwater aquarium at the Xishuangbanna Primitive Forest Park in Xishuangbanna, southwest China's Yunnan province on January 5, 2020. As the first of this kind in China, the aquarium is home to native freshwater species from the Mekong River, freshwater fish species from the Yangtze River and other rare amphibians. Photo:Xinhua

Tourists visit a newly-opened freshwater aquarium at the Xishuangbanna Primitive Forest Park in Xishuangbanna, southwest China's Yunnan province on January 5, 2020. As the first of this kind in China, the aquarium is home to native freshwater species from the Mekong River, freshwater fish species from the Yangtze River and other rare amphibians. Photo:Xinhua

Tourists visit a newly-opened freshwater aquarium at the Xishuangbanna Primitive Forest Park in Xishuangbanna, southwest China's Yunnan province on January 5, 2020. As the first of this kind in China, the aquarium is home to native freshwater species from the Mekong River, freshwater fish species from the Yangtze River and other rare amphibians. Photo:Xinhua