Rare bird: 'Half-male, half-female' cardinal snapped in Pennsylvania - BBC News
Meaning of the Cardinal - HubPages
11 Interesting Cardinal Bird Facts You Should Know - Birds and Blooms
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A Northern Cardinal in North Austin
Madness Takes Its Toll — I'm sure most know what a northern cardinal is.
Northern Cardinal
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Northern Cardinal : What's not to love? – Bird Protection Quebec – Protection des oiseaux du Québec
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Northern Cardinal Habits, What they Eat, When they Nest, Mating Habits