Most people think of pest control as being for mice and other rodents of that sort: catch, kill, and eat...or present, to the horror of the owner, which I'm sure the cat is confused about as they are wondering why this human is screaming in terror at their gift when that gift is what they're praised for doing. (Thankfully not much of that in my household, but it's a trope for a reason.)
However, as it turns out: kittens aren't just good mousers. They're good...buggers? Fly hunters? (You can't exactly call them fliers.) Now, granted. This is something we if we can try to avoid. You know the expression, "Wouldn't harm a fly?"
Well, I'm the type of girl who takes it one step further and would actively try to save a fly. Even if the fly is, say, a mosquito. They're innocent enough creatures; I wouldn't want to massacre them. Of course, this can sometimes be hard to do. So we don't always succeed. Some ants are harder than others; some spiders are harder than others; some flies are nearly impossible to catch.
So when we fail, we might have a pest flying or crawling about the room...and yet, increasingly, it seems to be not for very long. Starlight (our kitty) is very good at her job, and she rather enjoys it, and will loudly complain when she is prevented from doing it, be it out intervention or simply her target being out of her reach.
I thought this an interesting thing to convey at the very least.