The book contains information on the identification, geographic distribution, habitat preference, and vocalizations.
Each species account is presented on the left, while respective illustrations are adjacently on the right page.
It was one of the first widely known bird field guides, printing 325,000 copies of the first edition over the course of three years.
[1] Jon L. Dunn and Eirik A. T. Blom served as chief consultants for the second edition, with art contributions from 17 artists.
Jon L. Dunn, Jonathan Alderfer, and Paul E. Lehman were the primary consultants for the third edition.
One of the fourth edition's significant updates was the addition of 250 revised range maps.
Other updates included revisions to plumage and taxonomy information, new illustrations, and a new quick-find index system.
The fifth edition involved the addition of thumb-tabs for general bird families such as hawks, sandpipers, warblers, etc.
[9] It is effectively acts as a reference book, but not as a field guide due to its size.
[9] In addition to the information in the regular field guides, this expansion contains family introductions, addition information in the species accounts, and in depth identification techniques for hard to identify species.