Koko the gorilla amazed the world with her ability to use sign language. When she chose a kitten named “All Ball” as her companion, their bond showed the purest form of love. After the kitten’s tragic death, Koko mourned deeply, proving that animals too feel love, grief, and heartbreak. #Koko #Gorilla #TrueStory #AnimalsFeel #heartbreaking #deaf #ai #news #viral | Tassilo Sieben

Koko the gorilla, whose remarkable sign-language ability and motherly attachment to pet cats helped change the world’s views about the intelligence of animals and their capacity for empathy, has died at 46. Koko was taught sign language from an early age as a scientific test subject and eventually learned more than 1,000 words, a vocabulary similar to that of a human toddler. She became a celebrity who played with the likes of William Shatner, Sting, Leonardo DiCaprio, Robin Williams and Mr. Rog

Koko the gorilla mastered sign language, raised kittens and even once playfully tried on Robin Williams' glasses. Here's a look back at her life: http://nbcbay.com/X9DkMR5 | NBC Bay Area