Economic Importance for Humans: Negative
Some humans feel that barn swallow nests are a nuisance, and are ugly when they are attached to buildings and other man-made structures. Large colonies in urban areas can also create heath risks for humans. Finally, the disease called salmonella can be transmitted through the feces of barn swallows. This poses a threat to animals that live near barn swallow colonies.
Negative Impacts: causes or carries domestic animal disease
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