The Baculum in the Chipmunks of Western North America

The Baculum in the Chipmunks of Western North America by John A. White delivers a meticulous, readable study of a little-known anatomical trait with outsized taxonomic value. Combining natural history and zoology, White's 1953 monograph examines the baculum—the penile bone—across chipmunks of western North America, offering measurements, detailed descriptions, and 19 illustrative figures that illuminate subtle species differences. White outlines methods and materials, provides a practical key to bacula within the subgenus Eutamias (Neotamias), and presents species-by-species accounts—from Eutamias alpinus and E. minimus to E. townsendii and beyond—highlighting variation in shaft, tip, keel, and base. A thoughtful discussion compares baculum-based classification with skull- and skin-based systems, situating the work in mid-20th-century mammalogy and museum-based research. Ideal for mammalogists, taxonomists, vertebrate morphologists, museum curators, graduate students, and naturalists intrigued by rodent anatomy and historical scientific studies, this audiobook makes a technical classic accessible. Listen to gain a deeper understanding of chipmunk taxonomy, morphological methods, and the historical foundations of North American rodent systematics.