A woman feeds a chimpanzee with water at Samut Prakarn Crocodile Farm and Zoo in Samut Prakarn province, Thailand, Aug. 18, 2019. (Xinhua/Rachen Sageamsak)

A woman feeds a chimpanzee with water at Samut Prakarn Crocodile Farm and Zoo in Samut Prakarn province, Thailand, Aug. 18, 2019. (Xinhua/Rachen Sageamsak)

Tourists feed a chimpanzee and an orangutan at Samut Prakarn Crocodile Farm and Zoo in Samut Prakarn province, Thailand, Aug. 18, 2019. (Xinhua/Rachen Sageamsak)

A woman plays with an orangutan at Samut Prakarn Crocodile Farm and Zoo in Samut Prakarn province, Thailand, Aug. 18, 2019. (Xinhua/Rachen Sageamsak)

A woman feeds a chimpanzee with water at Samut Prakarn Crocodile Farm and Zoo in Samut Prakarn province, Thailand, Aug. 18, 2019. (Xinhua/Rachen Sageamsak)

A woman plays with a chimpanzee at Samut Prakarn Crocodile Farm and Zoo in Samut Prakarn province, Thailand, Aug. 18, 2019. (Xinhua/Rachen Sageamsak)