In B. musculus , the darker subspecies, B. m. brunneus , B. m. nigrescens , and B. m. pullus , occur in zones of rather constant high relative humidity, whereas the paler subspecies infernatis , musculus , handleyi , and to a less extent grisescens and pallidus , occur in zones of lower relative humidity.
— from Speciation and Evolution of the Pygmy Mice, Genus Baiomys by Robert L. (Robert Lewis) Packard
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