Biter Rats are one of the two types of minions that Stinktooth can summon. They can be found in the Fjolgard Sewers. More specifically, they may spawn in any of the four corners of Stinktooth's area. Although they can be defeated, they do not give reputation with Fjolgard. Once the target leaves combat, the biter rats will despawn.
Like any common Rat, biter rats will chase the target and use melee attacks. They automatically attack any 1 player or minion, unless attacked by another or are killed.