Voices and Vocabularies - Cardinals' Duet
The perfect guide to the birds of the southeastern United States, from the #1 birding website AllAboutBirds.org
All About Birds Southeast
Cornell Lab of Ornithology—Home Birds, Cornell Lab of Ornithology
Northern Cardinal Identification, All About Birds, Cornell Lab of
Northern cardinal
The NORTHERN CARDINAL 10 FACTS about them
Northern Cardinal - Montana Field Guide
Common Winter Birds
Information on the Cardinal Bird
Wild Republic Audubon Birds Northern Cardinal Plush
Northern Cardinal Identification, All About Birds, Cornell Lab of
Creature feature: The beloved northern cardinal