Wat Tham Pla is often called Monkey Temple after the macaques that live there. They are not usually aggressive though and only stay in one area near the fish pond and shrine to Kuan Yin, the Goddess of Mercy who is very popular with the Chinese. More recently though, the monkeys have started threatening visitors climbing to the upper cave, probably in response to being teased so be careful with your belongings and in particular don’t openly carry food as this seems to be what they are after.