Sheppard Software
Sheppard Software: Finches
This site gives an in-depth description of a finch, including its behavior, appearance, types, and classification. The site includes photos and illustrations and an interactive quiz to test your understanding.
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.