Last night everyone was fine. This morning, one of my pullets (11 weeks old) would not get off the perch, and her head was drooping heavily. I went to grab her and she flew off the perch, but because she cannot move her neck, she tripped and fell when she landed. I quickly scooped her up and brought her inside and put her in a crate. I have been giving her water with an eyedropper. This afternoon, another one from the same batch (11 weeks) started to exhibit similar signs, though not as severely. This other one can still move his/her neck, just slowly and he/she gets tired very easily. I put him/her on my lap to watch a show, and he/she stayed put the entire time, (and these are not tame birds). So I've been researching but nothing that I've found seems to fit. 1. Their legs and wings are fine, it's just their necks. 2. They still have good appetites. 3. Poop is normal. 4. No panting/respiratory problems. Any ideas?