Mountain Bluebird - eBird

Mountain Bluebird: Washington, Oregon, Idaho, Montana, Wyoming

Mountain Bluebird - Sialia currucoides - Media Search - Macaulay

Western bluebird Washington Department of Fish & Wildlife

Mountain Bluebird - Sialia currucoides - Media Search - Macaulay

Alix Arthur d'Entremont: 2015

10 Birds That Look Like Blue Jays but Aren't - Sonoma Birding

Mountain Bluebird - South Dakota Birds and Birding

Mountain Bluebird - eBird

Mountain Bluebird - eBird

Ask Maine Audubon: eBird database is a resource to track bird

Mountain Bluebird Identification, All About Birds, Cornell Lab of