There are some nice places, I killed mutated bats together with mutated tigers in The Unwary Mage - Fire Portal but you have to finish The New Frontier Quest and access to the portal in Quest Forgotten Knowledge.
I also recommend going to the Souleater Mountains. There are a large number of bats as well as souleater and other monsters
There are many other places but in my opinion these two are the best to complete a bestiary.
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