Ratkin

This is a rat-like race of scavengers that roam the universe looking for plunder, cheap bargains and things to steal. They cannot be trusted.

The Ratkin in Wizardry 8
The Ratkin have built themselves a base in the tree-city of Trynton, which is normally populated by the Trynnie. However, the Ratkin have driven them out of one part of the settlement in which they use spacious tree houses to breed.