Air space

An ongoing question, with all that space up there why do bugs and birds get hit as much as they do?  Maybe it's the classic, you only hear about the tragedies and nothing about the millions that fly around avoiding baseballs and car grills, not sure.  Well, I hit a bird this morning.  A quail to be exact.  Normally when they're in the road and a car comes they fly away.  Not always the case apparently.  I even saw a feather floating down in my rearview mirror.  I felt bad but if it won't damage the car don't risk damaging the car to avoid it, right?  Heartless.