This morning I found one dead chicken in my coop. She had no apparent signs of trauma, and she seemed fine yesterday, so I'm not sure what happened. Now, I have a rather lethargic chicken. She has simply been sitting next to our duck pond, and drinking an excess amount of water. She seems fine upon examination, except that she smells off. I brought her inside with some food and water, and I'm not sure what I should do next. She is a very special chicken and I really don't want her to die. Any ideas?