The Helm Guide to Bird Identification: An In-Depth Look at Confusion Species (Helm Identification Guide)

This book covers difficult identification issues by looking at tricky species pairs or groups of birds found in Britain, and comparing and contrasting their respective features. Designed as a field companion, it supplements the standard field guides and provides much additional information. As well as detailed texts, this book includes extensive illustrations of all relevant ages and plumages of the species concerned.