Monster in the Lake
I don't know what kind of lizard this is but it looked harmless.
However I'm told Thai people believe it is very bad luck. If you capture one and put it in the house of an enemy bad things will happen to them.
The colloquial Thai name is sounds something like "heer" which is a bad word.
I was also told it can eat turtles. That sounds like a tall tale, unless they meant baby turtles.