Author: Dunne, Pete, David Sibley and Clay Sutton,
Title: Hawks in Flight: the flight identification of North American migrant raptors.
Description: Boston, Houghton Mifflin, (1988). 4th ptg. VG PB. "A Landmark. The first book dealing with a new aspect of birdwatching - the holistic method." Roger Tory Peterson. Hawks are notoriously difficult to identify using the traditional field-mark method. This book shows how to recognize hawks ata a distance by their general body shape, the way they move, and the places they are most likely to be seen. Clear and lively text brings to life each species' distinctive characteristics, and their visual essence is captured in elegant drawings and photos.

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