I had a Rouen hen that went broody and ended up hatching eight ducklings. They are mixed with a Black Swedish. I could have sworn that they were dead because she stayed off of them for a whole night at around the 23rd day. But they decided to live and only three eggs died. The hen was also attacked by a skunk trying to eat the eggs but she managed to fight him off and only smelled like skunk for a couple of days. She is very protective and will hiss and attack you if you are not careful.