Comment by SpacemanSpiff

Birds are very different from drones in the sense that birds often practice active collision avoidance, at least in the case of encounters with a small aircraft. I have often seen birds take evasive maneuvers when a collision is imminent, much more quickly than I could have as the pilot of the aircraft. Drones at this point have no sense of self preservation when faced with a collision with an aircraft and are therefore in my opinion much more dangerous.