Author Leander Keyser devoted himself to years of intensive case studies of several American species of birds and compiled his work into this stellar volume. Keyser introduces the reader to in-depth insights into bird behavior in these pages and gives us the hows and whys of just what makes our feathered friends tick. This book is necessary reading for all those who want more than just the superficial descriptions of birds that many bird books provide.

This classic bird guide describes not only the avian life of the Rocky Mountains, but of the greater part of the Western United States. The book provides engaging and heartfelt vignettes of author Leander Keyser's birding adventures of in the beautiful Rocky Mountains as well as informative descriptions of the birds he encountered there. The book also provides a complete checklist of the birds of Colorado which also serves an a near complete listing of the birds of the Western United States