Bank Voles are easily confused with Field Voles. They are larger than Field Voles, measuring about 13 to 17 cm long. They have small eyes, small ears and a blunt snout. Adult Bank Voles have a rich chestnut-brown back compared to the grey-brown fur of the Field Vole. They also have a much longer tail than the Field Vole.
Click here for more information.: Bank Vole | BTO – British Trust for Ornithology