Fly versus glass window !

[uglymug]

hi, have been trying to find if there is a high speed film of a fly hitting a glass window, and what happens to the fly ?
weird i know but we have all heard them buzzing in at mach 1 to only hear them thwack into the window glass. How do they deal with it, why dont they knock themselves out, they just carry on buzzing as if nothing had happened !!! If it was us hitting a wall, well we all know what would happen. Only me just being curious.
have tried to do a search but cant find anything....................or can you ?