This early work on birds is both expensive and hard to find in its first edition. It contains details on the characteristics of hybrid bird species such as the bullfinch, chaffinch, redpoll and many more. This is a fascinating work and thoroughly recommended for anyone interested in ornithology. Many of the earliest books, particularly those dating back to the 1900s and before, are now extremely scarce. We are republishing these classic works in affordable, high quality, modern editions, using the original text and artwork.