Noun water vole has 2 senses
  1. 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
  2. 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
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