It's a trick of the light!
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Western bluebirds are right at home in Northern California
There is No Such Thing as a Blue Bird – National Geographic Education Blog
Eastern Bluebird - Photos, facts, and identification tips
When is a blue bird not blue?
Bird of the Month: Mountain bluebird
Bluebirds vs Blue Jays: 10 Key Differences
Frequently Asked Questions (FAQS) - - Bluebird Information and Resources
Site Index - - Bluebird Information and Resources
25 Amazing Pictures of Bluebirds - American Bird Conservancy