Sisters, OR, United States
I located an Osprey nest along the Deschutes River, not far from my home, in Sisters, Oregon. About 30′ away on a pole a Western Kingbird had built its nest. Each time the adult Osprey came in the adult Kingbird would fly from its nest and harass the Osprey by swooping and diving at it. On several occasions the Kingbird would actually land on the back of the Osprey and peck at its head. I could tell that this little Kingbird was really causing stress in the Osprey family. In time both the Osprey and Kingbird chicks fledged.