William S. Clark Knihy

In this authoritative reference, two of the world's top experts on raptors provide an essential guide to the variations in the species, allowing for easier recognition of key identification points. All the distinguishing marks described have been exhaustively tested in a wide range of field conditions. 365 photos.

An extensively illustrated guide to 39 species of hawks.

The bestselling guide to hawks is now completely revised and in full color, with 40 color plates and 140 color photos. Up-to-date maps show ranges for each season, and the text covers all 39 diurnal raptors seen in North America.