I'm not sure where to start looking. I'm new to the whole raising chickens thing. We noticed today that one of our BO hens was standing apart from the others and all fluffed up. I picked her up and her crop is soft and spongy. I couldn't feel any food in it but we added some scratch to the pen and she pecked at it. We've moved her into the chicken tractor away from the other birds just in case. Any ideas on where to start?