Uggie the dog at a 2011 screening of "The Artist" at Grauman's Chinese Theater in Hollywood, California. The Jack Russell terrier, who charmed audiences in the Oscar-winning movie and at his related red-carpet appearances, died this month at the age of 13. Click through the gallery for other celebrated animals.
When she was 12, Koko the gorilla -- who is able to use sign language -- wanted a pet. She got a stuffed animal. That wasn't satisfactory, so for her 13th birthday in 1984, she got a kitten, which she named All Ball. When the kitten died six months later, Koko expressed great sadness at her loss. She got two more kittens in 1985. Since the second one, Smoky, died in 2005, she's been getting cat visits from the Humane Society at her home at the Gorilla Foundation in Woodside, California.