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We've seen and caught two (rats) the same night almost a year ago, pest control came and fitted wire wool, but then nothing until the recent start of scratching and biting noises (but still didn't see them).
Last month we were in holiday for 20 days, once we came back we didn't find ANYTHING messed up, chewed or moved, apart from traces in the bathtub, where it looked like one of them fell inside and couldn't get out for a period of time as there were rat droppings inside.
Still, no other traces were found.
We put traps over a long period of time, but those rats are clever bastards, they never fall for them.
Have you seen them? I think mine may not be rats because of the small size of their shit. I still haven't managed to spot any with the endoscope though. It's a two-person job: one person to look at the screen, another to manipulate the endoscope. My girlfriend has limited appetite for either job. So far I've seen more shit, that's about all.