a brownish-gray Old World mouse,
now common in the U.S. in or near houses.
any of various greyish mice of the Old World genus
a common household pest in most parts of the world: family
Collins English Dictionary - Complete & Unabridged 10th Edition
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Later, humans were again responsible for giving the hybrids an edge over their pure-bred house mouse relatives.
But only six of these changes were the house mouse's own innovations.