Why Koko the Gorilla, Who Mastered Sign Language, Mattered(02)

Why Koko the Gorilla, Who Mastered Sign Language, Mattered(02)

Image gallery: Koko Yamada Leak

Koko - The Gorilla Who Talks - Meet Koko - Twin Cities PBS Koko the Gorilla Dies at 46 E! News UK Why Koko the Gorilla, Who Mastered Sign Language, Mattered