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The term has been used in reference to the behavior of the common swift, a close cousin of the chimney swift, but this behavior is likely common to the swift family.

People from New England to Texas are building fake chimneys as nesting spots and migration motels for chimney swifts, little birds that are dwindling in number as the nation’s architectural landscape changes.

It’s unclear how much of the chimney swifts’ decline is linked to chimney loss, especially since fake chimneys don’t always get used.

Even more stunning, the birds were chimney swifts, not racing pigeons.

A video originally posted to Facebook shows the chimney swifts slamming into the structure’s large glass frontage, which the witness told the Charlotte Observer continued for over an hour.