1. A water vole swam vigorously upstream.

2. A water vole swam vigorously across from a little island, its round face and bright eyes showing above the water.

3. Meanwhile, Strachan views the water vole as an indicator of wetland habitat quality, and he looks forward with little optimism.

4. Rob Strachan stresses that the water vole survey is the first of its kind.

5. The muskrat is a swamp-dwelling rodent something like a large water vole.

1. A water vole swam vigorously upstream.