When I was a boy, I remember how the rotten son of a farmer who lived not far from us destroyed all the Barn Swallow nests on his father's barns. He used to shoot Tree Swallows and Willow Flycatchers too. The adult swallows returned to South America for the winter that year without producing any young.
The next year there were more flies and mosquitoes bothering people and lifestock.
After a few years without the birds that keep the flying insect populations under control, there were an enormous amount of flies in the area during the summer. We couldn't go outside without being bitten.
Barn swallow (Hirundo rustica) https://eu.news-leader.com/story/spo...tica/15792329/
9 cool facts about barn swallows: https://www.cbc.ca/news/canada/princ...acts-1.3637139
Roadrunners were greatly appreciated by the Indigenous people of Mexico and the Southwestern US, because they kept the number of Rattlesnakes (which are toxic enough to kill a child) down to normal levels.
Coolest living creature on earth: The Roadrunner
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