Saw this insect on a log in my yard. Have never seen one like it before. It had a 3" "tail" that was made up of what looked like 3 "fibers." It twisted the "fibers" together and made a needle-like tail which it stuck into the top of the log. I thought at first it might be laying eggs - but I watched and photographed it for almost two hours and it didn't tire of it's ritual. What is it? It was certainly beautiful with it's iridescent wings, colorful body, and amazing "tail!"