There's collision avoidance systems, but those are really for "not flying into another plane". You're going so fast that by the time you can pick up that you're about to hit a drone or bird, you've destroyed it -and possibly yourself- already.

Military drones are a different matter: you will never find yourself in the same air space, because you will never be told they're there. They are ghosts, much like airplanes that run without a transponder "because it's legal". You don't see another aircraft unless you know exactly where to look, or you're right on top of them.