We got 6 ducks about 4 weeks ago, last week while my SO was out of town I came home to one dead in the corner of the pen. No body parts out of the fence no evidence of anything trying to get in but her neck was pretty matted up. I can home today to another one dead she was fully laid out and again her neck was very matted no evidence of injury. Anyone have any idea what may have happened/gotten to them? I'm so upset. They were both the same coloring too. I'm sure that has nothing to do with it but never know. They were gray babies but Rouen/mallard from TS. None have appeared injured all have been eating and drinking normally and are active. They were both next to the pool when I found them. I have witnessed them easily get in and out of the pool with and without the steps we have provided.