- water vole, water rat, Arvicola amphibius - common large Eurasian vole
--1 is a kind of vole, field mouse
--1 is a member of Arvicola, genus Arvicola - water vole, Richardson vole, Microtus richardsoni - of western North America
--2 is a kind of vole, field mouse
--2 is a member of Microtus, genus Microtus