"Although the killing of egrets is often cited for inspiring the U.S. conservation movement, it was the millinery (hat-making) trade’s impact on Barn Swallows that prompted naturalist George Bird Grinnell’s 1886 Forest & Stream editorial decrying the waste of bird life. His essay led to the founding of the first Audubon Society."
In the #Midwest #USA we mostly see them around small bridges over water.
https://www.allaboutbirds.org/guide/Barn_Swallow
#Birds #Swallows #BarnSwallows