Range. - Eastern United States, breeding from the Gulf to southern Canada. Winters in the southern half of the United States.

These familiar birds build in cavities in trees, usually below 20 feet from the ground, crevices among ledges, bird boxes and in any suitable nook they may discover about buildings, providing that English Sparrows do not molest them. They raise several broods a year, commencing in

April when they lay from three to six pale bluish white eggs (rarely pure white); size .80 x .60. The cavities of their nesting sites are lined with grasses and feathers usually, although I have found the eggs on the unlined bottom of cavities in trees.

Bluish white.

Bluebird.

Bluebird.

766a. Azure Bluebird. Sialia Sialis Fulva

Range. - This pale variety is found in southern Arizona and southward.

Its nesting habits are the same and the eggs are indistinguishable from the last.