Bird Library
Cornell Lab of Ornithology, All About Birds
Wikipedia. Birds , Hummingbirds , Orioles
Opususa.com, Birds and Feeding: Bird Identification
Audubon, Audubon at Home.
USGS, Breeding Bird Survey.
What Bird, Birds of North America, 2004
Bird Watching National Audubon Society, Audubon.
Bird Watcher's Digest Magazine, Bird Watcher's Digest hummingbirds.net, Hummingbird Migration Maps What Bird, Birds of North America, 2004
Cornell Lab of Ornithology, All About Birds.
Bird Feeding National Bird Feeding Society, Basics of Birdfeeding.
Cornell Lab of Ornithology, All About Birds.
Opususa.com, Birds and Feeding.
Protecting Birds
The Hummingbird Society, Hummingbird Species at Risk of Extinction.
Cornell Lab of Ornithology, All About Birds. | 
