Here is a link to a decent article on NFM and it has pictures of what they look like and their life cycle.
http://edis.ifas.ufl.edu/pdffiles/IG/IG14100.pdf
http://edis.ifas.ufl.edu/pdffiles/IG/IG14100.pdf
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Head shaking can be do to many things like frostbite, mites or lice, or a respiratory disease when there are mucus plugs they re trying to clear. Looat the skin for mites, take Q-Tip to the ear gently for ear mites, and watch for nasal drainage, watery or bubbly eyes, eye or face swelling, or sneezes, wheezes, rattles. The wattles can swell during frostbite.I know that this is a very old post, but did you ever find an answer? I have this problem. I have a dozen birds and one, roo, shaking his head frequently. I think I am going to try oil in his ears tonight and again in three days. If that doesn't work I guess I will medicate the flock. Ugh.