Economic Importance for Humans: Negative
Some humans feel that barn swallow nests are a nuisance, and are unsightly when they are attached to buildings and other man-made structures. Large colonies in urban areas can also create detrimental cleanliness and health issues for humans. Finally, salmonella can be transmitted through their feces, posing a threat to livestock that live in close proximity to barn swallow colonies.
Negative Impacts: causes or carries domestic animal disease
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