This has nothing to do with peregrine falcons, which are falcons, not eagles and are not being used here. Golden eagles do not usually go over 300 km/hr and 320km/hr is the _maximum speed_ they will hit. Saying 'several hundred', for something that is almost always in the 200s, is disingenuous. If someone has $2.75, I would not say they have 'several dollars'. But that gets into a discussion about if two is considered part of several and that is completely pointless.

In any case, they most certainly cannot 'generally' avoid rotors. I have seen birds of prey - as well as smaller birds - attack and/or collide with UAVs. I have never seen a bird escape uninjured except with a small quadcopter with plastic blades. If someone was orchestrating a terrorist attack they would obviously need some sort of payload, and would not be flying a palm-sized plastic-blade quadcopter.

I think eagles are cool and they're clearly majestic creatures. But using them to catch a set of spinning blades in the sky - when a bullet works just fine - is really stupid.

If something costs 2.75 it's common to say it costs several dollars. Now, you can be picky, but in common usage saying several hundred for 280-320 km/h is not wrong.

Anyway, birds learn so you can train them to avoid the blades. Shooting something near buildings is risky and loud even with buckshot. Birds can also follow terrain etc. So, while this is far from perfect it's not a terrible or useless idea.