One of my BO roos is not in very good shape. He keeps his tail very low (almost dragging the ground). He can hardly keep his eyes open and he keeps his head held tight against his shoulders. He seems to be very weak and can't keep his wings up against his body or walk very much. He does have his appatite, but I haven't seen him drink. I'm worried he's dehydrated. I have him in my house so he'll be warm and easier to work with. Any advise?