Apparently, giant eagles and such liked to rip our ancestors' faces off. Or, worse than that, ~"punch holes in their brain and hover over them while they died before returning to rip at the skull."
I don't get it. Why return to rip at the skull, when there's a tasty monkey butt laying there? What were these, zombie eagles? When you hear that long, horrible raptor screech, you didn't realize that was just a high-pitched version of screaming "brains," did you?