This volume investigates the geographical distribution and breeding ranges of avian species across the Western Palaearctic region. The authors, C. J. O. Harrison and Crispin Fisher, utilize extensive ornithological data to map the presence and migration patterns of birds throughout Europe, North Africa, and parts of the Middle East. The work provides a systematic framework for understanding the spatial ecology of these populations within a defined biogeographical zone.

The text serves as a foundational reference for researchers and serious bird enthusiasts interested in the biogeography of the region. Its structured approach to mapping species distribution provides a clear, clinical resource for those studying avian population dynamics.