From 'Futility Closet' a beautiful story about Koko the gorilla.

"Koko the gorilla is famous for mastering more than 1,000 signs based on American Sign Language, which she uses to communicate with Stanford researchers.

That's not all she's learned from humans. One day her attendants discovered that a steel sink in her enclosure had been torn from its moorings. When they confronted her, she pointed to her pet kitten.

"Cat did it," she signed."

The cat mentioned was a cat that Koko had asked for herself and had given the name 'All Ball'. Unfrotunately, the little kitten escaped from Kokos cage later that year and was killed by a car.
Koko was distraught and talked about her kitten soon after -

"When asked, "Do you want to talk about your kitty?"
Koko signed, "Cry."
"What happened to your kitty?"
Koko answered, "Sleep cat."
When she saw a picture of a cat who looked very much like All Ball, Koko pointed to the picture and signed, "Cry, sad, frown."

More about Koko HERE and HERE