I would agree with the Horsefly suggestion, I once hit a bat and it left fur and guts across the impact zone, which happened to be my visor.
On the same theme, I know what a wasp tastes like after one hit the mouth vent on my lid this year, surprisingly sweet...
Was it an astronaut? .. ( That was ment to say Australian... I was hoping it was an Australian... But an astronaut would be a good kill as well... Especially an Australian one.. do you get them? I guess you do as they are all space cadets)