But when evolutionary biologist Abby Grace Drake and her colleagues scanned 1,810 skulls of cats ... of this in non-human animals. Their chicks instinctively peck at a red spot on the parent ...

The unearthed bones are dominated by remnants of skulls, nearly all of them from animals that have horns or antlers. Limbs, jaws, teeth and all other bones are comparatively rare at the site.