There was an area that I (and another NAFEX member) used to exercise Harris hawks during the summer months, and as the hawks followed along the shoreline of a pond, they were harassed by several other species. Most prominently, orioles, kinglets, and worst of all... Eastern Kingbirds. The kingbirds had amazing timing and just as the hawks left the limb of whatever tree they were sitting in, and began to fly ahead to their next chosen perch, a kingbird would whip over, bind to the scapular feathers of the hawk and pull at the feathers in the hawk's nape. It was incredible. They looked like little jockeys, riding hawks.