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Barn Swallow: Breeds from southern Alaska east across Canada to Newfoundland and south throughout most of the U.S. and into northern Mexico; spends winters in the tropics from southern Mexico to areas south and in Eurasia. Preferred habitats include agricultural lands, suburban areas, marshes, and lakeshores.
Barn Swallows often cruise low, flying just a few inches above the ground or water. True to their name, they build their cup-shaped mud nests almost exclusively on human-made structures.