This is what is commonly called the Eave Swallow in the East, because of its habit of plastering its nests on the outside of barns or other buildings, up under the eaves. In the West they usually resort to cliffs where, sometimes, large sections of the face will be completely covered with the little mud flasks; often colonies of several thousand will build their nests together.
Song.—A continuous twitter, uttered while on the wing or at rest.
Nest.—A flask or gourd-shaped structure of mud, lined with straw and feathers, attached under the eaves to the outside of buildings or on the faces of cliffs; five to seven eggs are laid; white dotted and spotted with reddish brown (.80 × .55).
Range.—N. A., breeding from the Gulf to Greenland and Alaska; winters in the Tropics.
BARN SWALLOW
613. Hirundo erythrogastra. 7½ inches
Female duller plumaged and with a less deeply forked tail than the male. Forehead and throat chestnut and entire under parts buffy; tail deeply forked and with a white spot on the inner web of each feather except the central pair.
This is the most graceful and beautiful of all our swallows, and is the most common about farmhouses, the inside beams and rafters of which they appropriate for their own use. They delight in skimming over the rolling meadows or the surface of ponds, now rising with the wind, now swooping downward with the speed of an arrow.
Song.—A continuous, rapid twitter.