This morning I went to feed and water and found one of my ducks injured and one missing without a trace. We had 2 ducks together in a pin with a duck house. The duck left behind has a small circular wound on the side of her head and a larger wound on her lower back. The other is just gone no feathers no gore nothing what could have done this and how do I treat the wounded duck I worry about maggots or infection in her back wound