The bluebirds are a North American[1] group of medium-sized, mostly insectivorous or omnivorous birds in the order of Passerines in the genus Sialia of the thrush family (Turdidae).

[2][3] A molecular phylogenetic study using mitochondrial sequences published in 2005 found that Sialia, Myadestes (solitaires) and Neocossyphus (African ant-thrushes) formed a basal clade in the family Turdidae.

Bluebirds can typically produce between two and four broods during the spring and summer (March through August in the Northeastern United States).

[7] In traditional Iroquois cosmology, the call of the bluebird is believed to ward off the icy power of Sawiskera, also referred to as Flint, the spirit of the winter.

[8] "Bluebird of Happiness" is a song composed in 1934 by Sandor Harmati, with words by Edward Heyman and additional lyrics by Harry Parr-Davies.

"(There'll Be Bluebirds Over) The White Cliffs of Dover" was composed in 1941 by Walter Kent to lyrics by Nat Burton looking forward to a time when World War II would be over.

"Bluebird" is a song written by Stephen Stills and recorded by the rock band Buffalo Springfield in 1967.