I don’t know how to write this article about bluebirds, blue birds, Blue birds or Blue Birds found in this area. All four spellings plus a hyphenated form are found in various bird books. I, myself, prefer the single word of bluebird.
Friends returning last week from Santa Fe told me they had seen bluebirds eating juniper just south of the state line in New Mexico. My friends thought the birds were on their way back for the summer. They well may have been.