It is sad part of being a chicken mom....you will over time lose some chickens. I am saddened with each loss but I still love raising chickens so I try to learn from each loss and know better to prevent losing one of the girls from the same loss twice. The hardest losses are the ones you have no idea what caused it. I found a broody austrolope in the nest box and when I went to check on her the next day she had passed away. I thought.....she was just broody....I have no idea what caused her to go. I just buried her and I will miss her as she was much loved. I cannot replace her but I have pictures of her and I will remember what a lovely curious chicken she was. I have six new sweeties in the run now ....two are cream leg bars and three are birchen marans and I have a basque and I am looking forward to learning to know them better in continue my education in chicken keeping. Hugs to you I am sorry for your loss - I do love the orpingtons too!