Her toothless chewing is already an internet hit and now Moo Deng, the pygmy hippopotamus, is starring in cosmetic ads and quickly becoming a brand ambassador for Thailand.

But the 2-month-old’s meteoric rise to online stardom has also prompted her caretakers to urge visitors to behave and limit the time they can see her.

Moo Deng, also known as the “bouncing pig,” was named after a vote from more than 20,000 children and tourists on the Facebook page of the the Khao Kheow Open Zoo in…