Seems that birdstrikes (not deliberate attacks by angry birds) are pretty reare on helicopters - unlike FWs.
Had a very near miss once when two wedgies were fighting in mid-air and crossing my path and I thought they would hear me and get out of the way. But they were obviously too busy trying to grab each other in flight and I just managed to have them pass beside the pax side of the cabin and avoid the tail rotor.
Seems they have to be intent on attacking you or really otherwise distracted to cause an actual strike.