By the human way of reckoning, Koko is surely the world's most accomplished gorilla, having mastered more than 1,000 words in American sign language. In doing so, she has helped overturn age-old preconceptions about the limits of animal intelligence, expressing thoughts and emotions of astonishing sophistication.
http://www.pbs.org/wnet/nature/koko/
How wonderful that Koko can go to a nice sanctuary on Maui, HI