I've been searching and found a couple of possible issues, but I want to treat them the right way. I have 5 young chicks (oct 5-Oct 14th hatch dates) and all of them are shaking their heads. I first had two Orpingtons which were ok (had a bout with Cocci, but it cleared up). They didn't shake their heads until recently. I then bought 3 silkies from Bobbi Porto and they had a head shake. When I asked her about it she said all her silkies do that..so I didn't question her. Lately, the Orpingtons are also head shaking. It seems pretty constant when they are relaxing. I don't see it as often when they are out of the brooder and running around. If we hold them and they start to fall asleep, it wakes them up. It's almost like a twitch. I searched for head shaking and found info on Gape worm. I don't notice any other symptoms. Their crops seem to fill when they eat and empty normally. They are not frequently "yawning". Their poop seems normal most of the time and when its not "normal" it seems consistent with the "other normal" poops they have once in a while. Every once in a while one of them sneezes, but there's no mucus. They all free range for an hour a day on most days. They are on medicated feed and have been since our bout with cocci. I am frustrated with the lack of information on head shaking without other symptoms. Has anyone had a whole flock with a headshake and no other symptoms..or maybe other symptoms I'm not noticing. Thanks!