3-Year Old Boy Fell Into Gorilla Enclosure, But What The Gorilla Did Next Shocked Everyone

15. Koko

Image: Jane Goodall

Binti Jua’s aunt is the legendary Koko, a Western Lowland gorilla whose ability to learn sign language stunned the world. Koko could understand 1,000 signs and also knew 2,000 English words. She scored between 70 and 90 on IQ tests and before she passed away in June of 2018, she had been the subject of peer-reviewed scientific studies and several documentary films.

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