Comment by ruralfam

Well, these are barn swallows. They eat up to 1,000 insects per day, and up to 100 mosquitos per day (link below). We have at least a dozen, so perhaps 1,200 mozzie per evening (I hope). I think barn swallows are the most populous bird species. Again they are pretty cool. We also have lots of bats, but they are harder to track. HTH, RF.

https://worldwidebirder.com/what-do-barn-swallows-eat