Because he's a bird?

It is not obvious to me that a bird will flee from anything that approaches it, regardless of past experience, simply "because he's a bird". See above about city pigeons. Or aggressive geese at the park. Or birds that get sucked into jet engines because they apparently don't consider a jumbo jet to be an obstacle worth avoiding, hence this conversation.

> Or birds that get sucked into jet engines because they apparently don't consider a jumbo jet to be an obstacle worth avoiding, hence this conversation.

The problem there is that the bird has no time to react. Planes are way faster and actually suck air.

Even city-dwelling pigeons have a personal space bubble that they will try to protect if possible. It may be just a foot or two but it is still there.

The smaller that bubble gets, the greater the chance of a drone actually striking a bird, which could become a major legal liability [1].

[1] https://en.wikipedia.org/wiki/Migratory_Bird_Treaty_Act_of_1...

I'd imagine airports could get a waiver to pursue the birds for human safety. Airports are generally well acquainted with working with the government.

Or maybe the drone could be equipped to zap birds with some small electrical charge. They'd learn the lesson quickly