We have seemed to develop a nest somewhere in the back yard and they like the kids fort. I havent found the nest yet but I cant figure out what these are. They dont seem to bother me when I walk up to them but I just dont like the idea of a wasp/hornet stinging a little kid and if they are allergic to them. I was able to kill one and they look like a wasp head, but the wings are huge like a moth. I would say they are an inch to 1 1/4 long and 3/16 wide