its an osprey, and their normal habitat is to build platforms high up in broken trees. many utility companies have taken to put platforms on posts in otherwise suitable environments where the trees have been cleared.
at least he will never be on a commercial for a cell company saying "Can you hear me now"
edit note, assuming crop sensor, my guess is about 60 meters away, or the better part of 200 feet. Many times i say you can avoid a big expensive lens, if only you have patience to move closer (zoom with your feet) Here, even if you were to spent &10K on a lens, or cut the distance down the equivelent of 10K of glass it wouldn't help at all. What you have is a "record shot" you can prove you saw an osprey, and not much more.