I observed the above eagle at the Medford Boat Club for approximately 30 min.  The eagle then flew towards Sandy Beach in Winchester and perched in a large Pine Tree.  I watched the eagle from Sandy Beach for 15 more minutes. Driving south along the Mystic Lakes in Medford, I observed another eagle perched in a tree along the Lower Mystic Lake.  I believe this was a second bird,  below are some more photographs.