Giant Rat in Norway In China cought giant rat with weighted 2.73 kgs,1 inch long teeth,12-inch long tail, & size of a cat Found in Joburg Weighing nearly 3.5 pounds, and measuring 32 inches from nose to tail, the Bosavi woolly rat is one of the biggest rats in the world. Most surprising was that the rat was completely tame, a sign that animals in the isolated crater were unfamiliar with humans. It is a true rat, closely related to the rats and mice most of us are familiar with, but so much bigger. Sekian, Eddy Rizal