San Diego Zoo Global
San Diego Zoo: Hummingbird
This resource provides detailed information on the hummingbird, as well as several vivid photos and a video.
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.
Other
Illinois Raptor Center: All Creatures Great and Small
This brief site provides two very interesting pictures which depict the size of hummingbirds when they are born.