Hawks in Flight: The Flight Identification of North American Migrant Raptors

254 pp. Includes photographs by Clay Sutton, illustrations by David Sibley, and a foreword by Roger Tory Peterson. Because they fly at great distances, hawks are notoriously difficult to identify using the traditional field mark symbol. Here, birdwatchers are shown how to recognize them by their general body shape and movements. 92 drawings, 173 photos.