It's simply a descriptive name. The bluebird takes its name from its bright blue feathers, and the Eastern variety is found in the eastern part of North America.
The scientific name of an Eastern bluebird is Sialia sialis.
The common name is bluebird, Latin name is Sialia Sialis.
Nothing. These are the same species.
It's found in Eastern North America, and it's blue.
The Eastern Bluebird is the state bird of Missouri.
The eastern bluebird is Sialia Sialis.
Eastern BluebirdThe official state bird of New York is the Eastern Bluebird, adopted in 1970.The Eastern Bluebird is the state bird of New York
A eastern bluebird is covered in feathers.
The scientific name of the eastern bluebird is Sialia sialis.
The same as a western bluebird's: feathers.
It is bluebird!
a cat