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Lasers. Might incapacitate, kill, or blind crows, would need to avoid collateral damage. Maybe with remote human intervention on the kill switch, one person per bank of 50 drones.

Nathan Myhrvold supposedly displayed a mosquito-killing laser photonic fence some years ago [1]. A laser to deal with crows would need to be much more powerful.

[1] https://www.fastcompany.com/3059127/what-happened-to-the-mos...

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No, we're not going to go around maiming animals just to satisfy your thirst for drones and lasers.

Clean kill or nothing.

Firing drone-lasers powerful enough to burn or blind might not be a good idea, especially where beams could bounce off reflective surfaces.

A ground-based laser would pack a lot more power.

I know of some towns in upstate NY that employ "crow hazing" techniques to harass and eventually drive away large flocks. Typically these groups tend to use nonlethal (and as non physically damaging as possible) methods like air rifles and lasers, and sometimes just bright lights.

http://www.wwnytv.com/story/37317955/crow-hazing-in-watertow...

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