They just need to be more difficult to find and less worth the effort. The books are also silent on how humans protect themselves, so how are they surviving? Please explain how any race survives in monster world without farming communities and villages.
I mean, here's a map of Bremen, one of the villages in FR Ten Towns. Notice anything missing? Like a super tall wall surrounding the village?
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How about Easthaven?
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Nope. No wall indicated there. How do these places even survive with the near constant raiding parties?