Andrew Gosler, PhD, is the editor of Ibis, the journal of the British Ornithologists Union. He is university research lecturer in ornithology at Oxford University.

Chris Perrins, PhD, is professor of ornithology at Oxford University. The editor of the authoritative Firefly Encyclopedia of Birds, he was appointed Her Majesty's Swan Warden.

One of the most comprehensive single-volume reference works on birds ever produced.

With photographs and descriptions of over 1,300 species, plus a full listing of every bird species in the world, this outstanding reference is an up-to-date portrait of the world birds. An international team of ornithologists provides concise descriptions and reveals the latest science in bird evolution, behavior, ecology, classification and identification. Organized by region and habitat rather than species, the book allows for a more instinctive understanding of birds and their relationships with each other and the environment.

The opening section on bird evolution and anatomy explains species classification and identification, showing how DNA research is causing a re-evaluation of the known science.

The directory makes up the bulk of the book. It is divided into six sections on the Earth's zoogeographical regions. Each section is written by a recognized authority and includes a thorough review of species, habitat and threats, and conservation organizations. Along with specially commissioned artwork, each species description includes:

Scientific and common names

Physical characteristics, behavior, habitat and distribution

Conservation status

Similar species, with cross-references.

This superb reference closes with an up-to-date list of the more than 9,800 species of birds recognized by ornithologists.