My muscovy ducks Polly and molly are sitting on eggs of their own and 6 eggs each of my hens. I didnt set out to do it but the girls kept stealing the eggs from the nest boxes. Molly my black mussie threw 2 eggs out the other day that were due on the 6th of January they turned out to be not fertile. So i put some omore under her. the first lot are due on the 6th of jan and the second lot plus her duck eggs are due to hatch the 16th the white duck polly's eggs are al due the 19th of jan. They have been very gentle with the eggs i was worried that they might break them but the girls arent very big and the hen eggs are huge. I candled the chook eggs due on the 6th and can see little babies I will keep you updated.