About This Book
A comparative anatomical study examines the baculum across western North American chipmunks, defines shaft, tip, keel, and base, describes methods and measurements applied to nearly two hundred specimens, presents a diagnostic key and illustrated species accounts detailing variation in length, shaft compression, keel size, and base shape, and contrasts bacular-based groupings with classifications derived from skull and pelage, concluding that bacular morphology provides useful taxonomic characters for distinguishing closely related taxa.
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