I have lovely ducks laying 2 eggs a day and I am 99.9% positive they are fertile. I have 3 males and 2 females and have personally caught them doing the nasty every night around 10 pm and I always have 2 large eggs in the morning. I have left them to see if the girls will go broody but so far no go. Sooooo....since I do not have an incubator and am not really all that interested in having more I thought I would throw this out and see if anyone is interested. Carry on.