Chimpanzee’s are incredibly similar to homo sapiens and have been known to learn to use sign language. Although the “Planet of the Apes” films take this to an extreme, it is true that they can communicate through sign language. One of the first documented Chimps to learn sign language, Washoe, could effective use 240 signs. This may be the most for a chimpanzee at this time, although as researcher continue to learn more about chimpanzees it is safe to assume that someday they would be able to learn much more. For instance a gorilla named Koko started learning to sign at one year old and has learned more than 1000 signs and can understand 2000. She is able to understand some spoken English and even answered peoples live questions in the first ever interspecies chat in 1998.
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