The Gambian Pouched Rat (Cricetomys gambianus) is native to Africa and is the world’s largest rat, reaching up to 9 pounds. The average size is 3 pounds, measuring 20-35 inches from the head to the tip of the tail. The body is gray to brown in color, with a lighter belly. Beyond its large size, this rat can be distinguished by its long (14-18 inches), almost hairless tail, with the last third a lighter, off-white color. The Gambian pouched rat gets its name from the way it collects food by stuffing its cheek pouches.