Birds used to eat us and in doing so they shaped our behavior.

These types of discoveries give us real insight into the past lives of these human ancestors, the world they lived in and the things they feared.

These critical clues were puncture marks in the base of the eye sockets of primates, made when the eagles ripped the eyes out of the dead monkeys with their sharp talons and beaks. It was a marker that others hadn't noted before, that linked eagles definitively to the kill.

It just shows that you can never stop looking. Just because something has been studied for years doesn't mean that it can't still tell us new things.

I almost dropped down when I looked into the eyes of the skull as I saw the marks... they were perfect examples of eagle damage. Thousands of scientists, including myself, had overlooked this critical damage.

These birds would have been after the most vulnerable members of the group.