|
 |
|
Class Aves
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
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]
|
 |
|
|