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Northern Cardinal Identification - All About Birds
Northern cardinal - Wikipedia
Northern Cardinal | Audubon Field Guide
Northern Cardinal - All About Birds
The 3 Species of Cardinals in Hawaii (Pictures & Facts)
Northern Cardinal (Cardinalis cardinalis) - Hawaii Bird Guide
Hawaiʻi Birding Trails | northern cardinal - Hawaii.gov
Northern Cardinal - eBird
Northern Cardinal - American Bird Conservancy
Northern Cardinal - All About Birds