In the 40-second film, King Kong is taunted by a human on the other side of a cage. The ape then breaks free, attacking the human. The human then grabs a red hammer and precedes to hit King Kong. Frightening stuff.

The mini-film was shown twice to the Chimpanzees, 24 hours apart from each other, each time their eyes being tracked. On second showing, the red hammer changed locations. Watch the video below – the red dots represent where they are looking.

What is remarkable about the video is that, on second viewing, their eyes quickly dash to the hammer before anyone goes near it. They also predict where the human will move to in order to grab the weapon.