The genus primarily refers to water voles , a group of large, semi-aquatic rodents found across Europe and northern Asia. The most well-known species is the European water vole ( Arvicola amphibius ), famous as the inspiration for "Ratty" in The Wind in the Willows . Key Characteristics & Identification
While often mistaken for rats, water voles have distinct features: arvicola
: They have a blunt, rounded muzzle, small ears almost hidden in thick fur, and a furry tail, unlike the scaly tail of a rat. The genus primarily refers to water voles ,
: Typically 14–22 cm long with a tail of 9–14 cm, weighing between 150g and 300g. : Typically 14–22 cm long with a tail
: Primarily herbivores, they eat grasses and aquatic plants, often leaving stems cut at a distinctive 45-degree angle . Conservation Status