many monkeys in history have also been able to learn American Sign Language. For example, in 1970, Koko the ape learned how to sign American Sign Language by a trained teacher. A few years later, Washoe the ape learned American Sign Language and is currently able to sign more than one hundred thirty two words! After Washoe was able to learn how to sign American Sign Language, without any assistance, taught his son how to sign American Sign Language as well. Later, four other monkeys were taught to…
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