Some humans feel that swallow nests are a nuisance and unsightly simply because they are attached to man made buildings and structures. No special status Farming is becoming more modernized and the barn swallow is slowly losing places in which to build its nest. Barns and hay lofts are now enclosed, and farm machinery takes up an increasing amount of space. Barns are no longer built to be wide and spacious. One complete molt takes place while the swallow is in the south.
Barn swallows spend a large amount of time in the air and have unusually strong flight muscles.
References Hosking, Erik. 1946. Campbell, Bruce. 1993. A Dictionary of Birds. The British Ornithologists' Union. Life Histories of North American Flycatchers, Larks, Swallows, and their Allies.