I hit a completely demolished deer once at 80mph. Other than cracking my bumper, and painting my white car solid red/pink, all was well.
The truck in front of me that hit the deer didn't fare so well, I am sure. I saw it run out in front of that one, so it was in one piece at that point.
I know it was in pieces because you could see the smear along the top where it sort of cleaned the blood spray (think bloody, but as if someone took a bloody rag and made a single swipe cleaning a small strip), but then I also had stuff stuck to the bottom of the car as well, so I drove over part of it.
It was a mercury sable, so, while not low, definitely could not have run over much of a deer with no damage. There was no damage to the top, so I didn't go under a lot of it either.
It all happened so quickly, in a huge cloud of red though, so I am not sure exactly what happened, but my car sure had an interesting smell, and I was cleaning fur out from all the seams for months.
My sleeping passengers were a bit traumatized though.