About seven years ago an employee of Stanford University (USA) penny Patterson began an experiment which may change our understanding of the animal world. She opened a possibility of contact between man and those whom we call “our smaller brothers”. Penny Patterson is a specialist in the field of psychology that explores the mechanism of communication in humans and great apes. Since 1971, penny started working at the San Francisco zoo with a young female gorilla called Koko. Two years after the start of classes Coco managed to pick up from the zoo and placed in a separate trailer laboratory at Stanford University. Here, the gorilla got a lot of freedom: it had access to all premises of the laboratory, including in Penny’s room.