Also
- food may be easier to source than electricity in certain rural area
- auto scale mating
- no replacement part shortage
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2 comments
There is a legality aspect as well. Drones are not permitted to fly in all places. Where I live, they can't fly above private property (without the property owner's permission) or near airports.
Such rules, of course, do not apply to birds.
I suspect that training time for a pigeon is a lot longer than programming time for a drone.