The second volume of the series "Biodiversity of Bulgaria" deals with both parts (Bulgarian and Greek) of the Eastern Rhodope Mountains. The book consists of three articles on the flora (1962 species of higher plants) and 45 articles on the fauna (4329 animal species, both vertebrates and invertebrates). The volume contains also zoogeographical analysis of each group, data about relicts, endemics and sites of importance for conservation. The huge amount of information is provided by more than 56 authors from Bulgaria and abroad. The book is indispensable for any zoological library, especially those collecting faunistic surveys, as well as for zoologists, biogeographers, conservationists, collectors and all lovers of nature.