Zoo director Banyat Insuwan noted that the rare monitors are a highlight of the event which would include academic and leisure activities.
He said that there are fewer than 20 black throat monitors in Thailand. This reptile, originally found in South Africa, is tame and not dangerous to children. The exhibit will run until the end of this month.
The biggest of them is called Giant, which is loaned by a private owner. Aged 13, he weighs 15kg.