Very out of date by now, but...
On the way to Lunnun 8 days ago, there were numerous red kites. The good lady at the Falcon Inn said that someone in Thame was probably feeding them, since they occurred in agitated flocks. I subsequently saw such a flock of 20-30 kites over Watlington and stopped to watch. The birds were, circling, wheeling, diving, maybe even tumbling, in a way that looked more like a display for the mating season than a feeding frenzy. I didn't see any of them diving to field level. It was an incredible display of aerobatic skill, way beyond the effortless gliding that seems the norm. Has anyone any idea what was going on?