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For nearly five decades, psychologist Francine Patterson taught a western lowland gorilla named Koko a modified sign language — and Koko reportedly learned more than 1,000 signs, understood 2,000 spoken words, and mourned when her kitten was killed

From Space Daily · · Curated by DeafMonitor

For nearly five decades, psychologist Francine Patterson taught a western lowland gorilla named Koko a modified sign language — and Koko reportedly learned more than 1,000 signs, understood 2,000 spoken words, and mourned when her kitten was killed
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