Geographic Variation in Red-backed Mice (Genus Clethrionomys) of the Southern Rocky Mountain Region

Geographic Variation in Red-backed Mice (Genus Clethrionomys) of the Southern Rocky Mountain Region by E. Lendell Cockrum offers a rigorous and readable investigation into the subtle diversity of a common North American rodent. This scientific monograph and natural history study, first published in 1952, traces patterns of morphological and geographic variation across the southern Rockies and documents the recognition of two previously unnamed subspecies alongside clarification of others. Cockrum combines careful specimen comparisons, range mapping, and historical taxonomy to illuminate how elevation, locality, and climate shape populations of red-backed mice. The analysis situates findings within mid-20th-century mammalogy, clarifying nomenclature and distribution for genera such as Clethrionomys (Evotomys) and providing precise notes on type localities and regional variation. The tone balances technical detail with accessible explanation, making complex taxonomic conclusions comprehensible. Ideal for listeners interested in zoology, biogeography, field biology, or the history of American mammalogy, this audiobook is a valuable reference for researchers, naturalists, and students wanting a focused, authoritative study of rodent variation in the Rocky Mountain region.