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With more than 5,000 works cited, Handbook of Avian Hybrids of the World is the greatest compendium of information ever published on hybridization in birds. Worldwide in scope, it provides information on all reported avian crosses, not only those occurring in captivity, but also in a natural setting (approximately 4,000 crosses are covered). This book is a basic reference, intended both for the serious birder and the professional biologist. McCarthy's work fills a need for reference material that takes into account the last half century of data. It will be of interest to workers in a wide variety of fields, ranging from animal behavior to genetics, ecology, zoology, and systematics. In fact, it will make fascinating reading for anyone interested in birds and the natural world.
In 1990 Sibley and Monroe compiled a list of the world's birds. On that list were 9,672 species. In what has been something of a taxonomic revolution more have been added as vocalizations have been studied and DNA sequenced. Now there are likely to be close to 10,000 recognized extant species of birds, and many times that number that have gone extinct over the past 145 million years or so since the first know fossil bird, Archeopteryx. Speciation in Birds is an authoritative synthesis on the behavioral and genetic causes and consequences of speciation in birds.

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