I have a duck that has been sitting for several weeks....not sure exactly when she started because she was already sitting when I found her. I think it has been about a month since I found her. She definitely has some rotten eggs under her because the smell is AWFUL. My question is this, if I candle the eggs to see if there are any chicks, will I be able to tell the developing eggs from rotten eggs. If so, how? I also have a goose that started sitting within the past week. I had to run her off her nest and move the nest and eggs over about a foot from where it was because she had it right in front of a gate going into a pen.....I couldn't get in the pen to give the occupants water. I counted the eggs as I moved them and she has 25 goose eggs and 2 duck. There will be at times another goose to sit on the nest with her. I think I'll try candling them this weekend.