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Swallows
Birds of the air, that take their insect food on the wing. Migratory. Flight strong, skimming, darting; exceedingly graceful. When not flying they choose slender, conspicuous perches like telegraph wires, gutters, and eaves of barns. Plumage of some species dull, of others iridescent blues and greens above, whitish or ruddy below. Sexes similar. Bills small; mouths large. Long and pointed wings, generally reaching the tip of the tail or beyond. Tail more or less forked. Feet small and weak from disuse. Song a twittering warble without power. Gregarious birds.
