The gesaw rat was a diminutive, four-legged rodent originating from the lunar body of Carreras Minor, a moon. These creatures possessed dense, azure-colored skin and consumed power as their food source.
A number of these rats dwelled within Ania Solo's junkyard. One of them startled Solo's companion, Sauk, who was not acquainted with this particular species. Subsequently, a few more consumed the remnants of SD after it was obliterated by Darth Wredd, who was masquerading as Imperial Knight Yalta Val.