I have, on several occasions, had hummingbirds either attack or be curious to the point of getting within several inches of an AR Drone while hovering at about 60 feet. I don't know if they were just curious and checking it out or if they saw it as a threat and were attacking. There was never any contact with the birds but they got very very close. I have several video clips of hummingbirds passing in front of the camera and I have one clip of a hummingbird in a hover in front of the drone looking directly at the camera. A phantom would likely survive a minor birdstrike but I don't think the bird would be so lucky. I have seen quite a few videos of phantoms bouncing off from tree branches and power lines and still recovering.
The only thing that I have ever hit with my phantom was small bugs, lots of small bugs.