The single nestling is now two weeks old. A second egg in the nest did not hatch and at this point it can safely be said to not be viable. I guess the bad news is that we will only have one chick this season. The good news is that junior is not going to have to compete for food and attention.
The nestling is covered with a solid layer of downy feathers at this point. Mom will keep brooding him but he with the warm weather and the downy feathers he is also able to increasingly thermoregulate on his own. There will be increasing opportunities to observe him in the coming days. Mom will always be nearby but there will be more extended periods where he is not being brooded. By now his weight has more than quadrupled since the time of hatch.
The nestling will stay in the nest for several weeks yet. Osprey typically fledge (leave the nest) at 50-55 days. So we are looking at another five plus weeks.