It used to be that you could hang a shirt from a stick, put a hat on top, and scare off crows that way.
But these days, most crows aren’t scared by a traditional scarecrow.
So, farmers now fly drones around their fields to scare off the birds.
This works as long as the drones fly. Which isn’t very long, if you’re running on batteries.
While the drone charges, the birds feast.
But if you use ultra light-weight drones with solar panels, they’ll stay up all day long.
Then, all you have to worry about is running out of missiles.