I lost one of my 6 month old WH Ducks this morning. I didn't notice any change in behavior or any signs of illness. She seemed really happy. I found her in the coop. She passed while laying down and her neck is craned to one side. My coop is secure and there are no signs of a predator or injury. I have noticed she had a little bump on her belly for the last week. I thought it was a sign she was getting ready to lay but now I'm not sure. Two of the others have it too but not as prominent. Could this have been something else? These are my first ducks and I feel so awful. I don't know if my lack of experience is what caused this.