Earth Life
Earth Life Web: Bird Orders of the World
At this site from Earth-Life Web, you can find a list of 23 bird orders and additional facts on each species. Taxonomy and photos are included.
BBC
Bbc Nature: Crows and Ravens
Crows, ravens and their relatives are famed for being very intelligent birds. Several species, including the Caledonian crow and the rook, are known to use tools. Learn more about crows and ravens in this well-constructed overview...