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Hi Redhelen. I did think of a dormouse, but would one be so small. This one has a really long very thin tail. I do know that the smaller the animal, the shorter the life. However we had such a visitor about three years ago and I actually photographed
him/her, but I think this must be one of the offspring. It always comes under the fence from next door so I know it isn't resident in my garden! I will look up dormouse and see how small one is. Thanks for your interest.