Horrible things - I was carrying a crate of ducks into a pond once and felt something on the side of my neck and sure enough a horsefly had stabbed me! Big welt about 20 mins later…there’s an almost ache at the bite site when they are still stabbed in!
I have also had them go through a thin glove and leave a welt…
I have also had them go through a thin glove and leave a welt…