Hi, new to your post, thanks for being out there. I have searched books, internet, talked to people and have had a very hard time getting good information. I have several questions, please help if you can! HISTORY: I live in a cold climate (UTAH, mountains, snow in winter, below freezing, hot in summer). I bought 4 baby ducks (2 mallards, 2 Uprights) last April. We raised them with love and care and they are a big part of our family. In late September, two of my ducks (males) just flat out disappeared. Never found them, no feathers, etc. HEART BROKEN. My two females are now left. About days after the boys disappeared, my black up right duck started laying on her eggs. I didn't know which ones were old and which ones might be a baby. QUESTION #1: if the male "got" her, how long after she was fertalized will there be real eggs? Is there any way these are real eggs? She has been on the next FULL time and doesn't want to leave them. QUESTION #2: how can I tell if these are fertalized? I looked at the posting for telling about fertile chicken eggs, is this the same for DUCK eggs? QUESTION #3: If I determine these are not babies, can I/should I take them away from her? It has been about 2.5 weeks that she has laid on them full time. QUESTION # 4 Does SHE know if they are fertile or not? If they weren't real babies, why does she lay on them? QUESTION # 5: is a 100 watt bulb in a flood light over her head enough to keep her warm? They are in a horse stall, 12 by 12 with bedding and inside of barn but it still gets cold! Ok, so many more questions about keeping ducks warm in the winter but I will stop here and see if anyone has ideas so far. THANK YOU SO MUCH. Charlie and Petie, and Heidi the owner!