Last Sunday I new absolutely nothing about raising any type of egg/bird. Then I was given a choice to either A) try and give 9 duck eggs a chance to live or B) watch them being thrown in the trash. Despite my ignorance on the subject I decided to give it a shot. I went with B I quickly researched optimal temperatures and humidity for duck eggs (we think mallard) and put my nerdy engineering skills to work. Long story short I was able to put together a computer controlled incubator that regulates both temperature and humidity with an internal fan to circulate the air. I was able to get the eggs into the incubator within a few hours. I then immersed myself in learning all I could about the subject. Later that night I went to turn the eggs and (with my newly obtained knowledge) armed myself with a bright flashlight. I candled all 9 eggs and found 7 are very much alive and moving. It was very obvious that the other 2 were not viable. So, As of the time of this writing, I have 7 viable mallard (I think) duck eggs. I have been trying to determine how far along they are by candling them, tracing the air pocket and taking picture, then comparing those pictures to online resources. I'm having a hard time feeling confident about what they they are on. I could use all the help i can get. My biggest reason for wanting to know the age is so i know when to change the temperature/humidity, also so I know when to stop turning them. Here are the pictures I took tonight. The line on the egg was traced roughly 36 hours before the picture. I apologize for the quality/blurriness. I was trying to keep several small children at bay while taking these pictures Also, not sure if its helpful, but below is a link to a video showing movement. In Hindsight i should have propped the cam up so i could use 2 hands so you could see the entire egg better, sorry. Click ---> YouTube Video I was thinking they look to be about day 23ish but I have no confidence in the guess... What do you all think?