the bats in the maze (Combat, Stink Bat) do not aggro when you are resting or low on HP or anything. The only aggro by linking when your fighting another bat or when you attack one.
Also present in the Korroloka Tunnel, but it didn't aggro me. Maybe because I was lvl30. In Harutoto I got 3 vials of beastman blood from 10 bats with my 26thf.