A baby hippopotamus is causing a fan frenzy in Thailand ... zoo's director has urged people to behave when they come to see Moo Deng, after videos emerged showing visitors mistreating the animal.

What explains her charm? Moo Deng walking around her enclosure with her mother, Jona, in January at the Khao Kheow Open Zoo in central Thailand.Credit...Lauren DeCicca for The New York Times ...

Visitors pay to take pictures with the animals. At Sriracha Tiger Zoo, in Chon Buri, Thailand, cubs taken from their mothers at birth are kept in small cages and brought out for photo ops.