I bought 16 new road Island reds last Sunday. they were all well and healthy, feathers appetite, eyes and skin. No sign of illness whatso ever. I live in Texas and the temps are upper 20's to high 70's fluctuating in between the two. I noticed Friday I had one hen that's comb turned pale and she sat squatted all day in the sun and did not eat or drink. I isolated her in my quarantine pen with food and water and a heat light in the corner. She passed overnight. Today I have another hen who is squatting fluffed up and drank a little this morning but wants to be alone away from the other chickens. Her comb is red not discolored and she is not making any strange noises, just doesn't feel good. Any ideas? I do not want to lose another one.