Economic Importance for Humans: Positive
Barn swallows are quite effective in reducing insect pest populations. They also can serve as an indicator or trigger organism, indicating possible environmental trouble, as declines in their relatively abundant numbers may precede other more obvious effects of environmental stress.
Positive Impacts: controls pest population
- Moore, P. 2001. Dairy declines hard to swallow. Nature, 411: 904-905.
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