Sites

Class Aves - English
URL: http://animaldiversity.ummz.umich.edu/chordata/aves.html

Birds are vertebrates with feathers, modified for flight and for active metabolism. Birds are a monophyletic lineage, evolved once from a common ancestor, and all birds are related through that common origin.

[ eng ]

Handbook of the Birds of the World - English
URL: http://www.hbw.com/

HBW is the first work ever to illustrate and deal in detail with all the species of birds in the world. Volumes 1, 2, 3, 4 and 5 have already been published and Volume 6 is to appear in January 2001.

[ eng ]