The Eurasian water shrew is a mouse-sized insectivore with a moderately long pointed snout and a long tail with a distinct keel formed of stiff hairs which serves as a spine providing structural strength in the water. The water shrew has large feet with hairy fringes and small eyes and ears. The water shrews fur is dense, velvety grey dorsally and whitish beneath. The length of its head and body is around 2.8 to 3.8 inches and it weighs around 0.4 to 0.6 ounces. The Eurasian water shrew has a tail up to three-quarters as long as its body.
The Eurasian water shrew known by the brits simply as the water shrew is a fairly common rodent-like mammal. It usually grows to be up to 10 centimeters (4 in) long. Its tail can be up to 75% as long as the shrew itself. The fur of this rodent traps bubbles of air increasing buoyancy to a level where the shrew has to anchor itself in order to have longer dives. The fur is short and dark, often with a couple of white tufts, light belly, and a few stiff hairs around the feet and tail. Eurasian water shrews live in close vicinity to fresh water, like rivers or streams, where they can hunt for their prey.