Why is Koko signing "gorilla" to the vie

Why is Koko signing

Posted On: March 12, 2010
Date Taken: May 06, 2005

Photographer: Ron Cohn

Koko is looking through her new blue ViewMaster (remember the old red one) at a selection of photos of various animals. When Penny asks Koko what she"s looking at, Koko signs "gorilla" (chest pounding with both hands), and Penny discovers that that is exactly what Koko is looking at - another gorilla.

Why is Koko signing

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