Last year right after July 4th I found a single duck egg in my yard, I took it inside and put it under a desk lamp and used a $1 thermometer from walmart to monitor the temperature. That egg hatched August 11th and he is still alive today enjoying our back yard and creek. On July 8th I walked out to feed the wild ducks and found 2 eggs randomly scattered in the grass and 2 eggs in the creek. I picked up all 4 and set up my desk lamp again. Today I candled the eggs for the 1st time and found out that 2 of the eggs were infertile but the other 2 are alive! The link below is a video of me candling one of the eggs, interestingly the 2 eggs that are alive are the ones that I found laying in the water in my creek, the 2 I found on the land were the infertile ones!!