Today as I was watching Yoshi she kept picking her left leg up and shaking it, then she would put it back down but she'd do it again a few seconds later. She is putting weight on her leg, and can still perch. She is playing, eating and moving around the cage. She is preening her leg but still goes back to shaking? it. I dont know how to explain it. She was fine last night when I put them to bed, and fine this morning before I went to school. Does anyone know what this might be?