Natural History
The brush mouse (Peromyscus boylii) is a species of rodent in the family Cricetidae. It is a species of the genus Peromyscus, a closely related group of New World mice often called "deermice". It is found in mountainous areas of Mexico and the western United States at altitudes over 2,000 m (6,600 ft).
Carnegie Museum of Natural History.
Body size and species richness.
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