It starts the same way every year.
The male returns to a rookery. He may have mated here before, even been born here. This begins the new cycle.
Did I mention it’s boring, and they get hungry waiting. If they do leave for food chances are another Great Blue takes the spot.
The lucky ones find the remains from the last years hard work. Some come and find the branch, even tree, gone and they must find another suitable location.
Once they get situated they stand and wait for her.