You can see a rat snack to the left of the egg and it looks like the bottom of the nest is lined with paper.
It's not clear when Dora laid the egg, although I suspect it was March 23 as that was the first day she spent sitting in the nest. It's possible she could still lay more.
So, if we look at the stats from last year, the hawks are about a week earlier laying the first egg, and we can estimate it will take around 36-40 days to hatch. That means we can probably plan a 'Welcome to the World, Baby Hawk' party around May 1.
Previously.