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.
Other
Hummingbirds.net
This entire website is entirely dedicated to hummingbirds. This is a great place to learn more about different hummingbird species, attracting and feeding them, migration patterns, and more.
Cornell Lab of Ornithology
Cornell Lab of Ornithology: Allen's Hummingbird
Cool facts, photos, and sounds of Allen's Hummingbird are found on this informative site.