All of the sites described in the second edition, along with a host of new ones, have been visited, verified & been given revised or new text. The bar graphs of seasonal distribution & the section on selected species of birds has been updated. Entirely new in this edition are a brief summary of the islands` biota, complete lists of mammals & of amphibians & reptiles. Combined with thorough travel advice & information on local contacts & societies, this exceptionally well organised & rigorous guide is more useful than ever.