4 week old muscovy, we have (had) 3 of them. A brown, blue, and black. We put them in our new duck tractor with a kiddie pool, food, and a small house, long story short, we went to check on them, and the two were walking around peeping normally and the brown one was laying flat between the wall of tractor and the pool, dead. She was wet from the neck up and she had orange wet stuff all in her bill and it was seeming to come out of her bill. I thought it was blood but upon seeing the orange stuff, idk??? Husband thought her neck looked broken. But we just dont know. It is predator proof so nothing got in. Just wet neck and orange stuff??? No bite marks, we are shocked and worried for the other two.