Owls of the Northern Hemisphere presents the unique collaboration of the distinguished Dutch ornithologist Karel Voous and avian artist Ad Cameron. For bird, and especially owl, lovers everywhere, it is the definitive source of information on the 47 known owl species occurring north of the tropics. And for readers who admire and collect fine bird prints, it offers 50 superb full-color plates portraying an individual of each species. The descriptions of species are self contained, each combines a general summary with a detailed account. They are based on the most current data available and cover faunal type; distribution; climatic zones; habitat; geographical variation; related species; fossil species; structure, vision, and hearing; behavioral characteristics (songs and calls, circadian rhythm, antagonistic behavior); ecological hierarchy, breeding habitat and breeding; food and feeding habits; movements and population dynamics; and relationship to man. Highlighted throughout are some of the more controversial aspects of owl taxonomy as well as questions remaining to be addressed and areas that have yet to be researched. -- Publisher's description.