Gorrilla Asks for a Dentist

When Koko the gorilla had a toothache, she signed that she had pain in her mouth.  We know that dogs can learn hundreds of words, and we know that they can express excitement, anxiety, and disappointment.  Does anybody know how to teach them to signal pain?

The New York Times > Science > In Pain, Gorilla Puts In a Call to the Dentist

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