One bonobo had a long bamboo cane, which she was poking members of the public with, so we wanted it off her. I had a bag of four cakes which we were going to have for our tea, and I thought I would give her a cake if she gave me the stick. But she saw I had four cakes and she broke the bamboo stick into four pieces, one for each cake. It was more than clever. She worked it out in a split second.Here it is impossible to separate telepathy, subtle clues and sheer intelligence. The ape somehow picked up her keeper's intention to reward her with a cake for giving up the stick, and having seen the four cakes immediately thought of a way of getting all of them.
Rupert Sheldrake
Dogs That Know When Their Owners Are Coming Home - The Unexplained Powers of Animals
(1999) p.105