I have a black australorp pullet that is having crazy symptoms. Yesterday I found her upside down, wedged in behind the feed bin, no idea how she got there. I picked up her and placed her near the water dish and she had very bad balance. I assumed this was from spending time upside down and left her alone after a few minutes of her acting normal again. When I went back to the coop to check on her she again had wedged herself in the same manner. I noticed she keeps her head downward and walks backward with her neck twisted down and around and shakes. After about 10-30 seconds this stops and she heads for the food or water. Sometimes her backwards walking and shaking leads to her doing a somersault. This repeats every few minutes. I got out a 30 x30 rabbit cage I use for isolation of chicks and placed her in there to avoid her wedging herself in odd places again. She is eating and drinking but looks so pathetic with her neck twisting spazes. Any idea on what the cause could be or treatments for this? All other birds are acting normal. I will try to upload a video of this behavior soon.