I woke up and let the girls out. Noticed that one came out and laid right down. I came out a bit later and several are laying down. That is when I saw that some didn't come out of the coop. They were dead. I picked them up. There is no trauma. There was one young bird in the nest box that couldn't walk. Carried him out and set him down. Cannot stand. 1) What type of bird , age and weight. 6 or so are 1 year old hens Normal weight-Found dead A few are just laying around on the ground but get up when I walk to them. A few are 12 week olds. They were introduced about 2 weeks ago. The main flock and 12 week olds have all been vaccinated for Mareks. The ones that are dead I got from a farm store (Cackle supplied) and ones I hatched from bought eggs. They had not been vaccinated. I do have another separate group of the same 12 week old chicks (roos) and bantams and there is nothing wrong with them. They are in another shed. 2) What is the behavior, exactly. Woke up this morning to dead hens in coop. Several with weak legs. Came out of coop and laid down. 3) How long has the bird been exhibiting symptoms? All appeared normal through last night. 4) Are other birds exhibiting the same symptoms? One of the 12 week olds is displaying weakness 5) Is there any bleeding, injury, broken bones or other sign of trauma. None 6) What happened, if anything that you know of, that may have caused the situation. Nothing. 7) What has the bird been eating and drinking, if at all. All were eating and drinking yesterday. They get 21% meat producer. 8) How does the poop look? Normal? Bloody? Runny? etc. Most poops are normal I noticed a few have been loose and green (normal green). 9) What has been the treatment you have administered so far? Nothing just found the hens. 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? Will medicate if that is the treatment needed. 11) If you have a picture of the wound or condition, please post it. It may help. No wounds. 12) Describe the housing/bedding in use On pine chips since I got them around a year ago. Same company no changes. Any help would be appreciated. I live close to a farm store and can hopefully get whatever supplies I need to get the flock better!