Northern cardinal - Wikipedia
Cornell Lab of Ornithology—Home Birds, Cornell Lab of Ornithology
Northern Cardinal Identification, All About Birds, Cornell Lab of Ornithology
Solving the mystery of what causes bald cardinals - Farm and Dairy
Northern Cardinal Overview, All About Birds, Cornell Lab of Ornithology
Species Photo Viewer Northern cardinal, Pet birds, Backyard birds
Cardinals and Allies - Harpers Ferry National Historical Park (U.S. National Park Service)
Love birds of the backyard: Cardinals rule bird feeders with both royal color and pairing, Features
cardinal Northern cardinal, Ornithology, Cardinal
Backyard Birds of Eastern/Central North America: A Folding Pocket Guide to Common Backyard Birds (Wildlife and Nature Identification): The Cornell Lab of Ornithology, Waterford Press: 9781620052426: : Books