Wherever there are humans there are mice. No other creatures live in more environments than the two of us do. House mice—Mus musculus, as they are known on formal occasions—are wondrously adaptable with regard to environment. Mice have even been found living in a refrigerated meat locker kept permanently chilled at –10 degrees Celsius. They will eat almost anything. They are next to impossible to keep out of a house: a normal adult can squeeze through an opening just three-eighths of an inch wide, a gap so very tight that you would almost certainly bet good money that no grown mouse could
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