Howdy .
My wife and I have a modest honeybee ranch here in Alberta .
We have had bees for quite a few years now .
I would agree with the honeybee theory but not so much on the swarm or queen and drone one .
From first hand experience with a Parrot Anafi ( that was before I realized DJI was the way to go ) , .
One day I was out flying and decided to take some hive pictures for my wife for the seminars she does.
Well I was about 200 meters away from the drone I flew up and over one group of hives and took a few shots from directly above .
I walked closer with the idea of taking some shots closer and more at eye level .
As I got nearer I could hear a ticking noise from the drone, and I was about to land and figure out the noise when I saw it totally surrounded by honeybees , so the ticking noise was the bee guts and bodily fluids hitting the props .
Well I decided the best choice was to run , and send the drone home RTH .
Well after a 250m run which I’m not accustomed to my Anafi landed and it was thick with bee smoothie, there was still a few bees still intent on killing the evil drone .
So my theory on this is that the whine of the motors and or the spinning props must sound like a very real threat to the bees .when the Anafi was close to the hive they went all out to protect their home, queen, young and food stores .
So I believe that the sound from our flying machines is the problem.
I’m not sure if it would be possible to compare the two noises to see how close our drones match the sound of known bee enemies.
Oh last thing don’t worry about the bees that were killed , there most probably not that many killed and at this time of year the hives have more bees than you can imagine a standard hive can have forty to sixty thousand bees at this time of year and every day hundreds more are hatching .