The chimpanzee Washoe has died. Probably one of the most famous non-human individuals, Washoe, along with several other individual apes, played an important role in ape language and communication research.
Washoe learned around 250 American Sign Language word signs. Though there is debate about the extent to which Washoe could be regarded as using language, the research involving her helped clarify commonalities and difference in human and chimpanzee communication, as well as the qualities of chimpanzee cognition.
An article about Washoe can be found here.