Cats like to eat brains. My Jake eats the heads off the rabbits he kills and leaves the bodies in a neat row on the patio.
However, a human skull is pretty hard to crack, even for a large predator like a lion. It would probably take a hyena to get through to the nutrients.
The ravens in my neighborhood have that problem figured out with walnuts. They fly over and drop them on the pavement cracking them wide open. If only kitties could fly.