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House mice, which we are concerned with here, can cause genuine damage by gnawing through cables and contaminating food, and that is the species which requires control within homes. On the other hand, the harvest mouse is an exquisite little creature, the smallest rodent in Britain, living on seeds and berries and constructing tiny spherical nests high in grasses and bushes. I had one in the garden just outside the kitchen window. That nest was an architectural and structural masterpiece, and those mice will never come into houses at all.