Here the two peregrines are going in to the last week of incubation. Calculating the hatchday is tricky but we know that incubation takes 33 days from the moment incubation really starts.That will be after the second last egg has been laid. They do not start incubating before that. They just take care the eggs don't cool off to much.
It is essential that the eyases all hatch within 24 hours, or 48 at the most. That way they all have the same chance to be able to beg for food. Eyases grow amazingly in the first 2-3 days. They double their weight. A little newborn eyas will therefor never be able to compete with his sister who is twice his size. She will be the one who gets all the food and the last born will die.
So incubating starts at the same time. 33 days and the first laid egg will hatch.
How wonderful this strategy succeeds can be seen in James River Bridge where all three eyases where born within a few hours of eachother. They are all the same size and get all enough food.
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