Without bats feasting on mosquitoes the life on the North at summer would be unbearable.
This particular species feeds on Lepidoptera mainly, but Diptera are the second group most preyed upon (45% of diet, including mosquitoes). Smaller bats eat more mosquitoes, but is not clear how much. Each bat should eat between 600-1000 a night to survive only on mosquitoes. Fat juicy moths are preferred when available.