We have 6 chicks that have seemed healthy up until a few days ago when they started walking funny / having trouble standing up, 4 out of the 6 seems to be affected to varying degrees. The chicks have been free ranging with our adult flock of 8 other birds, but have an "escape" area only they can reach, and were not getting picked on. 1) What type of bird , age and weight? Black copper marans, 13 weeks old, seem a healthy weight (don't look thin etc) 2) What is the behavior, exactly. Sitting down a lot more often, when standing legs appear to shake, when walking raising legs very high, and leaning forward oddly. 3) How long has the bird been exhibiting symptoms? We noticed a few days ago 4) Are other birds exhibiting the same symptoms? 4 of our 6 chicks are affected, one very badly (can barely stand), one fairly badly (walks very strangely, has some trouble standing) and two mildly (walk strangely, can't run, still active) 5) Is there any bleeding, injury, broken bones or other sign of trauma. No visible trauma 6) What happened, if anything that you know of, that may have caused the situation. No idea After reading online we are thinking Mareks disease (but they show no other symptoms atm) or a vitamin deficiency 7) What has the bird been eating and drinking, if at all. All birds have been seen eating and drinking still, the two worst have been isolated with easy access to food / water. We're feeding them grower crumbles, but as they free range all day it is unclear how much of that each chick actually eats. 8) How does the poop look? Normal? Bloody? Runny? etc. Witnessed one of the isolated chicks do a terribly runny poo, am unsure about the others 9) What has been the treatment you have administered so far? We've isolated the worst two as there are concerns about them reaching the food / water 10 ) What is your intent as far as treatment? For example, do you want to treat completely yourself, or do you need help in stabilizing the bird til you can get to a vet? We would like to treat them ourselves as possible as I think vet could be very expensive for 6 chicks, and we have no car to take them. Our current plan is to knock together 6 individual crates so we can monitor what each chick eats in a day, and set them on concrete ground to make sure they're eatting the grower crumbles. 11) If you have a picture of the wound or condition, please post it. It may help. I can potentially take a video if it would help. 12) Describe the housing/bedding in use Free range all day, a shed with 3 in straw, and roosts (both natural and 2x4). Chicks tend to sleep on the floor, though. Any advice would be greatly appreciated, worried about my babies.