It's a trick of the light!
How To Attract Bluebirds - And Why They Are Great For Gardens!
Bluebirds' vibrant colors and sweet warble thrill, but they're not the hardiest and might need help - Cambridge Day
Bluebird Stock Photo - Download Image Now - Bluebird - Bird, Eastern Bluebird, Springtime - iStock
13 Blue Birds in Pennsylvania (with Photos) - Bird Feeder Hub
Myrna Pearman - Nature Alberta
Wisconsin's Bluebird Comeback: Beautiful native bird is thriving
Birds of Ann Arbor: Eastern Bluebirds – The Communicator
Can you share a picture of a bird that is blue but isn't the traditional bluebird? - Quora
Western Bluebirds on My Street – Foothills Clusters Wildlife