The Birds of the Western Palearctic is a comprehensive regional avifauna for the Western Palearctic. It consists of 9 volumes, the first published in 1977 and the ninth in 1994. The main editor for the first five volumes was Stanley Cramp. Cramp died in 1987 and the subsequent volumes were edited by Duncan Brooks and Christopher Perrins. BWP's format and breadth influenced the development of regional avifaunas for other parts of the world, notably The Birds of Africa. The titles of the nine volumes were:
A two-volume Concise Edition was produced in 1998. Both the full and concise editions were published by Oxford University Press. The boundary used for the region included Iceland, but not Greenland; all of Macaronesia ; North Africa; the northern parts of the Arabian peninsula; Iraq and Kuwait, but not Iran; and Russia west of the Urals. A number of subsequent papers have questioned the appropriateness of this boundary, particularly its southern and southeastern delimitations, among them Martins & Hirschfeld. Martins and Hirschfeld published a more detailed paper in 1998, discussing the boundary in Iran and the Arabian peninsula. They concluded that the mountainous western and northern areas of Iran, and the Arabian peninsula, except for two small enclaves in the south, should be included in the Western Palearctic. Ullman disagreed with their conclusions regarding the Arabian enclaves, however, arguing that their avifauna, when compared to species-rich areas in northeast Africa, justified inclusion of the whole of Arabia in the Western Palearctic. Roselaar, analysing the breeding distributions of 1037 passerine bird species in the Palearctic region, and northern parts of the Afrotropical and Oriental regions, also proposed a southern boundary somewhat to the south of that used by BWP. He excluded southernmost parts of Arabia, albeit with a slightly different border to that used by Martins & Hirschfeld. A journal, BWP Update, was published for a number of years following the completion of BWP. Three electronic versions of BWP have been produced. The first, produced by OUP, suffered from a number of technical problems. The second, known as "BWPi", was produced by BirdGuides Ltd. This included the full text of the nine volumes, the Concise Edition, all updates from BWP Update, new video and audio, and recent taxonomical changes. The third version was released as an iOS app by NatureGuides in 2020 with an integrated video library and updated taxonomy, though distribution and population data were not updated.
