StinkBug
Cleared for Takeoff
There are many more birds than there will ever be drones. They are autonomous, ignore all airspace restrictions, and some are very large and fly at very high altitudes (geese have been spotted in the flight levels).
Why no hand wringing? Just because we are used to them? Or is it because birds have "skin in the game"?
Birds have see and avoid. I worry about them too, but there's not much that can be done about them either.