The Collaborative International Dictionary
Sialia sialis
Bluebird \Blue"bird`\, n. (Zo["o]l.) A small song bird ( Sialia sialis), very common in the United States, and, in the north, one of the earliest to arrive in spring. The male is blue, with the breast reddish. It is related to the European robin.
Pairy bluebird (Zo["o]l.), a brilliant Indian or East Indian bird of the genus Irena, of several species.