The Mountain Bluebird (Sialia arctcia) was adopted as the state bird for Idaho by the legislature in 1931. The Bluebird is 6 to 7 inches long and is a member of the Thrush family. Male Bluebirds are a pale sky blue over most of their body, darker on their back.

Idaho operates under its original constitution of 1889, and, typical of states admitted to the union after the American Civil War (1861–65), it has a constitution that establishes the usual separation of executive, legislative, and judicial powers but limits the governor's strength.