They are doing my head in, as well as my face and my skin. When wheat etc has been harvested they magically all disappear. Where the hell do they go to reappear next year. Most find their way into the picture frames on the wall, but all they do in there is die. WHY ??
The purpose of thunderflies is exactly the same as every other living species on the planet, us included. They exist to reproduce and ensure the survival of their species, that's all, then they die.
Lets look at bees, wonderful creatures that pollinate crops and give us tasty honey. They give instructions to the hive where nectar can be collected that is miles away. Incredible memory. But the little fecker can't remember which window he came through to terrorise the house.