The Field Guide to the Californias is a wonderful part of the excellent San Diego Natural History Museum website. The Field Guide includes "Illustrated Guides", "Checklists", "Explore More About...", and "Places to Explore". The Illustrated Guides section has links to many types of flora and fauna, such as "Arthropods", "Reptiles and Amphibians", "Mammals", and "Plants". Each type leads to a further breakdown of guides, by species of animal or plant. Visitors interested in birds will find "Birds: Wrenderings" an archive of newsletters of the San Diego County Bird Atlas project to be of particular interest. Go under the heading "Explore More About..." on the right side of the page, to be able to read newsletters from 1997-2002.