The plural for the small rodent is always "mice" in modern usage. The plural of a computer mouse is either "mouses" or "mice" according to most dictionaries, with "mice" being more common. The first recorded plural usage is "mice"; the online Oxford Dictionaries cites a 1984 use, and earlier uses include J. C. R. Licklider's "The Computer as a Communication Device" of 1968. The term computer mouses may be used informally in some cases. Although the plural of a mouse (small rodent) is mice, the two words have undergone a differentiation through usage.
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