Great ape language
Research into great ape language has involved teaching chimpanzees, bonobos, gorillas and orangutans to communicate with humans and with each other using sign language, physical tokens, lexigrams (Yerkish), and mimicking human speech. Some primatologists argue that these primates' use of the communication tools indicates their ability to use "language", although this is not consistent with some definitions of that term.
Great ape language-1