I have been wanting a few chickens for years and finally built a coop ( 8X10) with a large 24 ft by 28 foot wired in pen and a smaller more secure pen on the other side of the coop. I hate to see them run totally loose as I also have a lot of hawks. I purchased 12 babies this spring and they are right around 16 weeks old now. ( Reds, Barred rocks and Production reds) One of the barred rocks seems a bit peeked yesterday. Tail down, eyes not wide open and a little lethargic. She does eat and is in good weight. Today she is opening her mouth and shaking her head as though she is trying to get rid of something in her mouth, I went out and bought some Duramycin-10 and just now put it in their drinking water. Is there anythiong else I should be doing. I am new to chickens but have owned and bred exotic birds in the past. It has been awfully hot here in Florida but the other girls seem to be fine right now.