Natural History of the Brush Mouse (Peromyscus boylii) in Kansas With Description of a New Subspecies

A careful series of field trips across fifteen carefully chosen sites in Kansas brings listeners into the world of the brush mouse, a modest rodent that thrives in the state’s mixed grass‑and‑brush habitats. Over the winters and springs of 1959‑1961 the researcher set snap‑traps and live‑traps, then followed captive specimens daily to record their behavior and feeding habits. By examining stomach contents and measuring captured individuals, the study builds a detailed picture of the species’ size, population fluctuations, and seasonal diet preferences.

The data reveal a surprising pattern of regional variation, culminating in the identification of a previously unrecognized subspecies in southern Kansas. Detailed measurements of skulls, tails, and coloration distinguish this new form from its nearest relatives, while the narrative walks listeners through the meticulous process of classification. In the first act, the work blends field adventure with scientific rigor, offering a compelling glimpse into how ordinary wildlife can surprise even seasoned naturalists.