Just wanted to post a quick update. The eagles at this site have been incubating the egg and probably benefiting from what has been a week of beautiful weather in Maine. For the sake of the eagles I hope this nice weather persists.
Do not be worried if at times to see the eggs unattended for short periods of time, especially in this fine weather. This is normal. Also, you will likely see the eagles turning the eggs so that they are heated evenly and develop properly.
The incubation period generally lasts for 33-35 days at which time the first egg will hatch followed by the next eggs each day or so. Eagle eggs, like the eggs of some other raptors hatch asynchronously. This could be considered to be nature's way of mediating the survival of offspring so that in times of low food abundance at least the first chick to hatch will survive because it will out-compete its siblings for food.
Please be in touch with questions and comments of your observations.
All the best,
BioDiversity Research Institute