Serious question and related to fixed wing too, not to take away any significance of this discussion - do bird strikes happen often at night? Are there many birds flying around other than petroleum fueled? I guess with the number of day flights versus night flights, the occurrences would be greatly reduced.
I once saw a bird strike on a chopper at Moorabbin. An EC120 was taxiing out to the northern heli-pad when he flew over some Seagulls next to Shell. The startled seagulls flew upwards straight into the blades. Around 8-10 Seagull carcasses hit the ground and the EC120 returned to the hangar. Probably a very expensive 4 minute flight.