Comes north about first or second week in April. Remains until late
September or October--builds and travels in flocks or companies--winters
in South or Central America.
Song--a constant twitter.
Head and upper parts except forehead steel blue--tail feathers marked
with white--forehead and throat clear chestnut colour--chest and lower
body paler chestnut.
Food--chiefly insects caught while on the wing.
Nest--built chiefly of mud--chooses under eaves or cavelike places for
building--mud mixed with grasses and (one authority also asserts) a
sticky saliva from the bird's mouth.
Eggs--white, tinted a delicate rose, and speckled finely with brown and
purple.--Two or three broods in a season.