This has always made me wonder. My father got a microscope in WWII and I used it a lot when I was a kid. We had a pond out back and I spent many hours looking at drops of pond water through it but only saw this once. One time I saw something for a few seconds and never saw anything like it again. It was about the same size as most of the rest of the microscopic living stuff in there, it was small. This thing was shaped like a ping pong paddle except that the handle came to a point, the paddle part was twisted. It corkscrewed through the water paddle first trailing the handle like a tail. That's why I only saw it for a few seconds, it moved fairly fast and I lost it. Strangest of all was that it was totally chlorophyl green. If this thing wasn't made of chlorophyl I would be surprised. I was under the impression that generally only plants have chlorophyl and they don't move around like an animal. Does anyone know what this is, has it ever been seen by anyone else?