I always tell people we eat rats here to varying responses including one of disbelief and disgust. However these are not Bangkok Rats, er, city rats, rather they live in the unpolluted rice fields.
My wife’s brother makes bamboo traps by hand for catching these rats. The traps are simple in design but very effective. They are spring loaded by a string which bends the long part of the trap into the shape of a bow when the trap is loaded. A small stick fits in between part of the trap and when triggered the bow is released sending a horizontal stick down at an angle.
We find holes in the burms of the sides of the rice fields and look for holes which may lead to the rats den. WE also look for recent activity indicating the den is actively used, such as scratch marks and or recent plant material.
Then we setup the traps in front of the holes and come back in the morning. If we are succesful we have several dead rats in the traps and out comes the concrete BBQ pit! Here is a photo of one of the traps: