Koko the gorilla, is a female gorilla who is able to understand more than 1000 signs on the the American Sign Language system and over 2000 words of spoken English.
Koko had a pet kitten, which she received on her birthday on July 1984. It was noted that Koko cared for that kitten as if it were a little baby gorilla. The kitten one day escaped from Koko’s cage and was hit by a car.
When she was told of what happened, this is how she responded.
It was also noted that afterwards she made weeping sounds like a human.
You can watch the full video here
And for anyone whose interested in animal language, here’s an interesting article on researchers translating chimp language