Water Vole
Overview
The European Water Vole or Northern Water Vole, Arvicola amphibius (formerly A. terrestris), is a semi-aquatic rodent
Rodent
Rodentia is an order of mammals also known as rodents, characterised by two continuously growing incisors in the upper and lower jaws which must be kept short by gnawing....

. It is often informally called the Water Rat or Ratty, although it only superficially resembles a true rat
Rat
Rats are various medium-sized, long-tailed rodents of the superfamily Muroidea. "True rats" are members of the genus Rattus, the most important of which to humans are the black rat, Rattus rattus, and the brown rat, Rattus norvegicus...

. Water voles have rounder noses than rats, deep brown fur, chubby faces and short fuzzy ears; unlike rats their tails, paws and ears are covered with hair.

In the wild, they survive for 2 years on average; most do not survive a second winter.
 
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