One of my all time favourite subjects.
Water voles are widespread around Europe, living in the banks of slow moving rivers, streams and other waterways. The waterside burrows of these strong swimmers have many floor levels that hinder flooding, as well as nesting chambers and a food store for the long winter months. Although water voles are a quick meal for many predators, the UK population suffered a catastrophic level of predation by the American mink. Water voles are often mistaken for rats. Ratty, in Kenneth Grahame's 'The Wind in the Willows', was actually a water vole.
Scientific name: Arvicola amphibius
Rank: Species
Common names: Eurasian water vole, Water rat, Water vole
Size Head-body length: 140 - 220 mm
Tail length: 95 - 140 mm
Weight 150 - 300 g