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Genus Sialia
Mountain Bluebird - The Mountain Bluebird is migratory. Their range varies from Mexico in the winter to as far north as Alaska, throughout the western US.
California bluebird - Adults have a grey belly. Adult males are bright blue on top and on the throat with a red breast; they have a brown patch on their back. Adult females have duller blue wings and tail, a brownish breast and a grey crown, throat and back.
Eastern Bluebird - Adults have a white belly. Adult males are bright blue on top and have a reddish brown throat and breast. Adult females have lighter blue wings and tail, a brownish throat and breast and a grey crown and back. Eastern Bluebirds are found east of the Rockies, southern Canada to the Gulf States and southeastern Arizona to Nicaragua.