This is a wider view showing the treetop:
Here is some activity in the treetop, one adult perching, another adult arriving, and at least two chicks in the nest. This image is one frame from the video below. If you watch the video it is easier to see there are at least two chicks.
Here is a view of the island in Foss Reservoir:
The location of the treetop is highlighted:
In this video you can see one adult perching, another adult arriving, and at least two chicks in the nest. It is hard to tell if the nest is behind the pine tree or in the top of the tree.
