I have 25 chicks from the hatchery (laying breeds, pullets) that are about 3 weeks old now. I also have four other chicks with their mother in a seperate pen in the same room. They are about 5 weeks old. Two days ago I noticed a chick was walking funny. I thought it was wierd that there was no sign of injury but I thought maybe she had twisted her foot and I would give it a day and see if she got better. The next day, one of the older chicks came up with the same symptoms. The day after that, another. And today, two more are walking the same way. They are all isolated now. Their toes are weak are curled in and they are sitting on and walking on their hocks (this affects both legs). They don't appear to be listless despite not really wanting to run around. Their crops are all full of food, they are eating and drinking. There are no other visible symptoms such as labored breathing, runny nose, diarhea, etc. So what could this be and what should I do in the meantime? I'm thinking it's either something very infectious or something in their food (since they are all eating the same food). Could it be Marek's disease? We didn't get them vaccinated this time.