Mice!
I don't play apartments, they're too squishy for my taste. So, I've yet to ever run into the critters in my game. Today, my singer Sim played a concert and out of the corner of my eye I could swear so...
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the only mouse holes I know of are the décor ones that came with cats and dogs - mice spawn every now and then and cats can play with them/catch them/ignore them (majority of the time) but they don't tend to affect my sims (but then again it was a basement thing and I didn't really have much down there at the time)
