Koko the gorilla has amazed the world over the past 5 decades with her ability to communicated basic ideas through sign language. Over the years she has captured many hearts by her love for kittens, strikingly human emotions, and celebrity friendships. There remains some debate about the exact depth of her language abilities. Her trainer claims she has a vocabulary of roughly 2000 words, though she does not use grammar nor syntax. Some are much more skeptical, and point to the 'Clever Hans' effect, in which a trainer gives subtle cues to the animal without being aware they are doing so. Through this the animal learns how to respond not through an understanding of what is being asked, but what seems to generate said cues.
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