A group of students watch Mali, a female hippopotamus, enjoying a feast of fruits, bread and vegetables during a celebration of its 50th birthday at the Dusit zoo in Bangkok, capital of Thailand, on Sept. 23, 2016. (Xinhua/Rachen Sageamsak)
A group of students watch Mali, a female hippopotamus, enjoying a feast of fruits, bread and vegetables during a celebration of its 50th birthday at the Dusit zoo in Bangkok, capital of Thailand, on Sept. 23, 2016. (Xinhua/Rachen Sageamsak)