Thanks for your comments. That day I managed to get several quite good shots. There was a fledgeling in the nest also. These platforms are put on top of hydro transformers in order to protect the lines. The Ospreys inhabit them each year. I was using the Nikor 80x400 VR lens. Handheld spot metered. The picture was taken quite near where I live which is in Northern New Brunswick Canada on the shores of the Bay of Chaleur.