86 An American zoologist put a large mirror in front of the chimpanzee's cage to observe their response. They can recognize themselves from the mirror and often look for the part of their body that they can't normally see in the mirror for a long time. Chimpanzee gorillas do not have this ability. From this we can infer:. ['Although the chimpanzees and gorillas are closer, the intelligence of the chimpanzees is slightly better.', 'Chimpanzees are better than gorillas in some ways.', 'This ability of the chimpanzee is related to the environment in which it lives.', 'Animals and other animals have this ability.']