Nothing. These are the same species.
Nothing. These are the same species.
The bluebird is a member of the thrush family, Turdidae. The eastern bluebird is Sialia Sialis.
The main difference is their range. The mountain bluebird lives mainly in the Great Plains. The Eastern bluebird lives in prairies, orchards and clearings in primarily the eastern US.
As for appearance, the major difference is that the eastern bluebird has an orange breast and the mountain bluebird has no orange anywhere.
The scientific name of the eastern bluebird is Sialia sialis.
The Eastern Bluebird is the state bird of Missouri.