Hand picked and photographed North American muskrat skulls for sale.  Some of these muskrat skulls have been glued shut with hot melt glue at the jaw hinge area. These muskrat skulls have been cleaned and are ready for display; however, they may be off-white in color and have small patches of discoloration.  An adult muskrat is about 16–28 inches long, half of that is the tail, and weighs from  1.3–4.4 lbs.   Muskrats are covered with short, thick fur which is medium to dark brown or black in color, with the belly a bit lighter; as the age increases, it turns a partly gray in color. The fur has two layers, which helps protect them from the cold water. They have long tails covered with scales rather than hair and, to aid them in swimming, are slightly flattened vertically, which is a shape that is unique to them. When they walk on land, their tails drag on the ground, which makes their tracks easy to recognize.