This fantastic book covers all the raptors of the world. The book is extraordinary good in the descriptions of the birds of prey, and the plates are fantastic. The book includes illustrations of adults, juvenile, male and female birds, and all the illustrations are great.
Furthermore there is introdoctionary chapters on identification of raptors, on their migration, breeding patterns etc.
It's great finally to have a single book covering all the raptors of the world, especially when the book is as great as this one. Everybody who have an interest in raptors simply needs to own it.
The only problem as far as I can see is, that it's impossible to take the book with you into the field, so I guess you still need your normal fieldguide.