My husband and I hatched a batch of buff orpingtons 2 months ago. A week ago, we integrated the chicks into our coop (3 hens & a roo--all very sweet, even the roo!). We watched them carefully and there didn't seem to be any pecking order issues or hostile behavior. The first few nights, the new chicks had a difficult time going into the coop (we'd go check on them and found them huddled together in the run, so we picked them up and put them in the coop manually). For the past four or five nights, though, they've gone into the coop themselves, so last night we didn't check (whoops!). This morning I went out to the coop and found one of the chicks shivering in the cold run (last night it dropped into the high 40s here). She had her head tucked behind her into her wing, but I when I reached for her, she looked at me. She's very very weak and isn't walking around, eating, or drinking. She can barely keep her eyes open. I've brought her inside with me so I can watch her and I've given her food and water (which she's refusing).
What's going on? Did she get cold/dehydrated that quickly overnight? Might she be sick or injured?
Any help would be appreciated--all other chickens seem very healthy and happy.