I hatched cayuga duck eggs last year and had 100% fertility but only about 60% hatch rate. They all developed until the end but most of those that did not hatch never pipped. I had the temperature at 99.5 degrees F to 101 degrees F with 50% - 65% humidity until lock-down and then I raised it to 70% - 75%. I had a brand-new Hova Bator with the circulated air and the automatic egg-turner. What did I do wrong - I did mist the eggs everyday. They also started hatching at day 25 when I increased the humidity. I just read the Wikipedia and it says " When using an incubator the temperature should be 99.5 °F at 86% humidity for days 1-25, and 98.5 °F at 94% humidity for days 26-28." From all I have read, this seems really high. Most people here do around what I did. Please help me as I have some more eggs I want to hatch this week and so I am going to get my incubator warmed up today so I can set them by hopefully Tuesday.