We have a Buff rooster, 1 araucana, 1 rir, 4 barred rock and 4 nhr. They are all between 22-26 weeks (except the aracuana is 1.5 yrs). We brought home 5 Ameraucana's yesterday that are 12 weeks old. Long story short, the lady who sold them to us was suppose to be keeping them until they were 19 weeks old(so they would be bigger/stronger with the rest) and out of the blue called and said they were really growing fast, we could pick them up. I asked her at least a dozen times if she were sure they were big enough to be put with the rest and she assured me everytime that they were. We waited until our current hens/rooster were asleep and put the others in with them quietly last night. When my husband went out this morning to let them out of the coop, he found two of the new ones lame. One is laying with both legs sticking out front and she isn't moving at all. The other is laying with one leg out front and scooting backwards when she gets scared. Otherwise they aren't moving around or eating. I didn't get documentation, but they were suppose to be vacinnated for marek's disease. They aren't showing signs of being ill, just not moving. When I called the breeder and explained what happened, she was silent for a minute then said, I've never heard of that happening before....really? I currently have the 5 Ameraucana's seperated, but am wondering if I should put the three healthy back in with the others and just keep the injured seperated? HELP!