This is a very wellorganized field guide. It is clear in its presentation ofthe facts and the language is without unnecessary complications. The sciencebehind t... » 

This is a very wellorganized field guide. It is clear in its presentation ofthe facts and the language is without unnecessary complications. The sciencebehind this popular presentation is very sound. The descriptions in general arevery concise.Henrik Balslev University of Aarhus Denmark «