Relationship With Humans
The Barn Swallow is an attractive bird which feeds on flying insects and has therefore been tolerated by humans when it shares their buildings for nesting. As one of the earlier migrants, this conspicuous species is also seen as an early sign of summer's approach.
In the Old World, the Barn Swallow appears to have used man-made structures and bridges since time immemorial. An early reference is in Virgil's Georgics (29 BC) ...garrula quam tignis nidum suspendat hirundo (...the twittering swallow hangs its nest from the rafters).
It is believed that the Barn Swallow began attaching its nest to Native American habitations in the early 19th century, and the subsequent spread of settlement across North America is thought to have resulted in a dramatic population expansion of the species across the continent.
Many cattle farmers believed that swallows spread Salmonella infections, however a study in Sweden showed no evidence of the birds being reservoirs of the bacteria.
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