Pond beast near beaver dam (140x + 5x iPhone movie). A 10-second movie, where this ball spins and moves is at https://drive.google.com/file/d/1qI-0Mdgdz-7ln7Jwy6hsQhetGWt2KkGl/view?usp=sharing


Please identify. Holly Stuart suggested synura, even without seeing the movie (I had the movie set to private). I think yes, and was surprised algae cold move so fast.