We are having a boom here, there are thousands of them. They are keeping the mosquitos away. My lasting impression of them is from a forest walk a decade ago,

We are having a boom here, there are thousands of them. They are keeping the mosquitos away. My lasting impression of them is from a forest walk a decade ago, where I was surrounded by hundreds of them, and I found them super clumsy. Every step I took I spooked a couple, and they would fly as fast as possible in a fixed direction, which resulted in dozens of them slamming into trees and knocking themselves out with an audible thwack.