Distribution of M. m. musculus (dark shaded) and M. m. domesticus (lighter shaded) in northern Europe and the North Atlantic region from previously published data and data collected here (Iceland, Greenland, Newfoundland). Areas with no shading either have no house mice or the subspecies distribution is unknown, and areas with some admixture of the two are shaded according to the dominant subspecies. The locations marked with asterisks are sites in Greenland represented by ancient DNA samples. From the mtDNA haplotypes, these were M. m. domesticus derived from the Icelandic population.
Jones et al. BMC Evolutionary Biology 2012 12:35 doi:10.1186/1471-2148-12-35