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Your best chance of finding one in Redridge Mountains is around Keeshan's Post (upper right corner of the map) where the Gnoll camps are. There are also several Mountain Cottontails and Roaches who tend to have them as back-up. The respawn is also quite fast. I found my rare there, a lvl 4 with 257 health. I didn't expect it to be rare since I battled several lvl 5 rats with 306 health and they turned out uncommon. Good luck!