The birds that harassed me are ground nesters and its breeding time now. Commonly called plovers but they are really masked lapwing or spur winged plover. I had one actually smash into my camera lens last year when I walked near their nest. Dad circled behind me and at the same time mum came head on at me. She actually hit my camera lens and pushed the camera back into my face breaking a tooth and cutting my lip in the process
I've seen footage of a raptor of some kind flying from its tree branch and smashed into the drone.
i couldnt see the birds until i started to fly the drone. After i put my heart back into the right position, i moved about 100m away and no problems.