This is the second edition of a book that you might have on your shelf already, although when it first appeared in 1999 it was called Owls - A Guide to the Owls of the World. The cover is completely new too and among the extra 66 pages are eight new plates while all of the originals have been revised and improved.
So is it worth buying this edition? The answer to that question really depends on how much you want to keep up with the frequent splitting of the world's owls into extra species. For example, within the genus `Tyto' the first edition only dealt with 17 species, but now we have 25 including a whole raft of new "Barn Owls" split from the familiar bird that we know and love. In fact, when I started to compare both books I realised just how much owl taxonomy has moved on in a decade. This new book recognises 250 owl species compared to just 212 in the first edition.
The main feature is the selection of 72 colour plates by Friedhelm Weick which show each species in a perched position and occasionally in flight. These face brief descriptions of the main plumage characteristics and a colour distribution map. The maps are also repeated at a larger scale alongside more detailed texts on identification, distribution, movements, habitat, measurements, habits, breeding, status and conservation. Due to their mostly nocturnal habits, owls' vocalisations are frequently the only clue to their presence. This book gives plenty of information on calls, and a CD of owl calls is planned for release to accompany it.
There is a scholarly chapter on owl taxonomy and the use of DNA evidence to determine species which will be of value to those working in that field but goes well beyond the understanding of most birdwatchers. There is also a section giving a good overview on how owls live and the adaptations that allow them to exploit a niche that other birds have failed to conquer.
This is one bird family that will simply continue to grow as ornithologists explore new areas, particularly in the Tropics. For example, in Sri Lanka the Serendib Scops Owl was only discovered a few years ago as people had confused its call for that of a frog. Meanwhile at San Isidro on the east slope of the Ecuadorian Andes there is a mystery owl still waiting for someone to describe it despite photographs being freely available on the internet. Perhaps we should not be surprised that new owl species are still out there to be discovered. They have become perfectly adapted for a world of darkness that will always keep us one step behind.