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 world a class of emigrants whose human prototypes the native American can barely withstand.

Cliff Swallow; Eaves Swallow: Petrochelidon lunifrons.

This familiar Swallow, which we in the East know as the bird who builds its much-modified, gourd-shaped nest under the eaves of old houses, is in the West wholly a cliff-dweller. With us the shape of the nest depends greatly upon the site chosen, many nests being merely elongated brackets. When it builds under the protection of shelving cliffs, the nests are of the typical bottle shape, and are often squeezed as closely together as the cells of a wasp nest.

This species is almost as brilliantly coloured as the Barn Swallow, but lacks the grace in flying which the sharply forked tail gives to the latter. Like all its tribe, it feeds upon insects, which it takes on the wing.

Barn Swallow: Chelidon erythrogaster.