One of my pullets has been limping slightly recently, and this morning while she was preening, I noticed that the foot/leg she has been favouring was raised *and trembling*. I managed to get some decent shots with the zoom; this foot looks normal to me (no obvious swelling or inflammation etc.) but maybe I'm missing something. Of is it an indication of some problem higher up the leg? Any suggestions to explain it and offer recommendations to help her would be welcome and appreciated.