Mammals of the Southwest Mountains and Mesas — Edition Insights

Taxonomic Organization and Descriptive Precision

Olin arranges the book by major groups—hoofed animals, rodents, carnivores—each entry following a consistent pattern: range, habitat, description, and behavior. The muskrat entry exemplifies this: 'Range: Virtually all of North America north of the Mexican border. Habitat: This large rodent can exist only near a permanent water supply.' Descriptions are quantitative, noting tail length in inches and weight in pounds, with attention to fur texture and foot structure. This systematic approach allows readers to compare species efficiently, though Olin occasionally inserts personal observations, such as noting the muskrat's 'long, flat tail undulates from side to side when it swims.'

Behavioral Observations and Anecdotal Detail

Olin enriches the guide with firsthand behavioral notes. The woodrat section describes a 'peculiar thumping sound' that 'indicates a gait which I have never seen but often heard at night,' suggesting a kangaroo-rat-like leap. He notes the 'ear-splitting silence' following the woodrat's hind-leg alarm signal. For muskrats, he contrasts their typical mound-building in marshes with their 'altered circumstances' in Southwest irrigation canals, where they 'react quite differently' and may go unnoticed. These details hint at Olin's field experience, though the excerpts do not reveal his specific methods or locations.

Adaptability and Environmental Context

A recurring theme is species adaptability. Olin writes that the muskrat's 'change in habits required by this different environment illustrates the great adaptability exhibited by many of our most common mammal species.' He emphasizes habitat constraints, such as the need for 'a permanent body of water of a depth sufficient for it to dive into and escape from its enemies.' The woodrat's tolerance of human dwellings is noted with dry humor: 'peacefully, but to the great annoyance of the human occupant.' Olin's focus on how mammals adjust to the Southwest's arid landscapes grounds the guide in ecological reality, though the excerpts do not detail broader conservation concerns beyond a brief preface mention.

Voice and Narrative Presence

Olin's voice is that of an informed naturalist who occasionally steps into the first person. He describes the woodrat's sounds as 'a gait which I have never seen but often heard,' and the 'ear-splitting silence' that 'literally presses in on one in the darkness.' The muskrat section includes a speculative phrase: 'It must be somewhat like the leaping flight of a kangaroo rat.' This blend of empirical data and personal inference gives the text a conversational quality. However, the excerpts are too brief to assess how consistently this voice appears across the full 57,810-word volume. The acknowledgments credit Dr. E. L. Cockrum for accuracy, suggesting a collaborative effort between scientific review and Olin's narrative style.

Readers will find Olin's guide most useful as a reference for identifying Southwest mammals through physical traits and habitat clues. The behavioral anecdotes add texture but should be treated as observations rather than systematic ethology. Bierly's illustrations, though not excerpted here, likely enhance the descriptions. For a fuller understanding, consult the index and references cited at the book's end.

That rainy afternoon, I kept returning to Olin's woodrat—that thumping alarm, a wild pulse in dry arroyos—and felt the ache of a place I'd never seen. Then, almost accidentally, I reached for Subspeciation in Pocket Gophers of Kansas, [KU. Vol. 1 No. 11] — Themes and Context, and the rain softened. Small burrowers, mapped by bone and soil, felt like quiet kin.