Why Are Bluebirds Blue?

It's a trick of the light!

Eastern Bluebird Missouri Department of Conservation

Western Bluebirds on My Street – Foothills Clusters Wildlife

Myrna Pearman - Nature Alberta

Mountain Bluebird Identification, All About Birds, Cornell Lab of Ornithology

It's Bluebird Time!

Mountain bluebird spotted in Wrightsville Beach a long way from home

Mountain Bluebird Trails Conservation Society - Southern Alberta

bluebird boxes: be a good landlord - A Way To Garden

Why are bluebirds blue? - Quora

Western bluebird - Wikipedia

When is a blue bird not blue?