Muskrat

The muskrat is found in wetlands over a wide range of climates and habitats. It has important effects on the ecology of wetlands. 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,[8] 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.