Astonishingly, a water vole under the pipe that's near the salt bin. It looked a bit confused - after all, half its natural cover's gone, the place looks like the Somme - but it ate some shoots I couldn't identify and then some buttercup leaves, and then swam across to the opposite bank. I watched it for about ten minutes till it made off through the water in the direction of the east culvert. I hope it wasn't an ave atque vale moment.
Will make sure I take my camera next time!