Rats could be one thing, however unlikely if you have never seen any around your property. Much more likely in Thailand would be geckos (as insects in the roof space would be plenty if there is enough space for them to enter), which would be really harmless, maybe even beneficial. If it is more "heavy" footsteps, it could be a Tokay (then you would likely hear it call though); getting rid of those would be non-trivial as long as they have food (for example then you would have none of the smaller geckos around). Even big insects like large centipedes are a possibility; careful, one bites you, it is a trip to the hospital and really nasty pain. The first things I would check for: - are there lots of geckos around (eg do your cats bring any they caught?) - are there visible spaces where animals could enter; rats can climb even vertical walls in corner spaces, better along or in rain pipes, so I would start looking in corners and roof connections to neighboring buildings; but there still would have to be some kind of opening at least 3-4 cm wide) - if there is any such opening, I would look for rat or mouse droppings; those are dirty animals and they always leave unmistakable traces; it would be a lot worse if the rats are able to enter your house and start gnawing on open food laying around, their droppings are quite toxic. Either way, happy hunting!
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