your talking about birds right......
last saturday, I was returning from a 4hr ride... It was dark, and I had no lights (didn't expect my ride to take that long), then suddenly something hit my helmet. I almost fell.. I stopped... looked back.... and it was a BAT!!!!
I was doing 38km/h.. and it was a head-on collision.. and the damn bat scatched my new helmet
BTW, my head didn't hurt.. but my neck did, for 2 days.