Revised, updated, and with more than 50 new colour photographs, ROCKY MOUNTAIN MAMMALS is a non-technical guide to the mammals of the Southern Rocky Mountains and their foothills, with special emphasis on Rocky Mountain National Park and vicinity.

In seventy-two species accounts, David M. Armstrong describes each animal and its signs, habits, habitat, and natural history, noting times when seasonal events such as elk sparring occur. Introductory materials and appendices offer rich context and wildlife-watching support, including a checklist with page numbers for quick field reference, an identification key, a glossary, derivations of scientific names, and advice on how, when, and where to watch mammals.

Armstrong introduces mammalian evolution, anatomy, and distribution and offers perspective on how the local fauna fits into its geographical setting and into past and potential future faunas of the region.