The way I read it ( and information I have heard about this) is that THIS IS A SURVEY OF CASES VETERINARIANS HAVE HAD OF CATS THAT HAVE FALLEN FROM HIGH BUILDINGS! THEY DID NOT THROW CATS OFF BUILDINGS TO COLLECT THIS DATA!!! In fact there have been so many cases that vets have a name for it; highrise syndrome. That some of these cats survived from amazing heights is rather amazing, and not exactly normal. I think evolution never intended them to survive much more that falling out of a tree It's the construction of the cats skeleton that makes it possible. Their extreme flexability allows them to twist about and right themselves in mid air so they can prepare to land. Cats falling from high enough have the chance to spread out and gain a little wind resistance to slow themselves slightly. This was discovered after data from various cases was compiled and it was discovered that cats falling from less than a certain height did not gain enough speed to be injured in a fall, and cats falling from above a certain height had time to right themselves and prepare, and most the injuries and deaths occured in heights between these two ranges.