Eastern (Sialia sialis), Western (Sialia mexicana), and mountain (Sialia currucoides). Bluebirds, members of the thrush family, tweet a melodic song. Males are mostly blue while the females are a ...

The eastern bluebird is a species familiar to millions in eastern North America. Polytypic. Length 7" (17.5 cm). Male: bright blue above, with orange throat, ear surround, chest, sides ...