QUOTE : Nikkie, a chimpanzee, once showed me how to manipulate attention. He had gotten used to my throwing wild berries across the moat at the zoo where I worked. One day, while I was recording data, I had totally forgotten about the berries, which hung on a row of tall bushes behind me. Nikkie hadn’t. He sat down right in front of me, locked his red-brown eyes into mine, and—once he had my attention—abruptly jerked his head and eyes away from mine to fixate with equal intensity on a point over my left shoulder. He then looked back at me and repeated the move. I may be dense compared with a chimpanzee, but the second time I turned around to see what he was looking at, and spotted the berries. Nikkie had indicated what he wanted without a single sound or hand gesture.