However,critics argued Washoe only learned to repeat sign language movements from watching her teachers.They said she had never developed true language skills.Even now,there are some researchers who suggest that primates learn sign language only by memory,and perform the signs only for prizes.Yet Washoes keepers disagree.Roger Fouts is a former student of the Gardners.He took Washoe to a research center in Ellensburg,Washington.There,Washoe taught sign language to three younger chimpanzees,which are still alive.

　　Scientists like private researcher Jane Goodall believe Washoer provided new information about the mental workings of chimpanzees.Today,there are not as many scientists studying language skills with chimps.Part of the reason is that this kind of research takes a very long time.

　　Debate continues about chimps understanding of human communication.Yet,one thing is sure-Washoe changed popular ideas about the possibilities of animal intelligence.

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