“When pets fall from high places, they don’t land squarely on their feet,” Mekler said. “Instead, they land with their feet splayed apart.” With cats, falling shorter distances can be more dangerous than the long drops because the animal doesn’t have time to adjust its body for the optimal landing.’
This kind of aerial adjustment has a limit, of course. In my experience the ‘sweet spot’ (optimal height to fall from, if you are a cat) is somewhere between 3 and 6 floors up. Still, even at those heights injuries are common. So don’t go trying this at home!