A Checklist of Birds of the World
This checklist gives no taxonomic data, it is simply a list of Orders, Families and Species. It is divided into two sections Non-passerines and Passerines. Both files are very large so if you want to see them be patient. If you want more information than is supplied here you need to get hold of a copy of Sibley and Monroe’s Checklist to Birds of the World (1990) and its 1993 Supplement.