I find that nuthatches are not too timid of photographers but they sure can move quickly. I tried to photograph a spider today with a body pattern that glimmered in the late-afternoon light and thereby resembled a piece of jewellery. Never seen anything like it. That spider would crawl at a fair clip when I had the camera pointed on it and then stop only when I pulled the camera away. As soon as I raised the camera again it would take off at maximum impulse power. Wore me out.