She is the most famous monkey in the world having appeared in a number of Hollywood blockbusters and currently being one of the most highly-paid stars on U.S. television.

But along with the success Crystal the Capuchin monkey has accrued since she first appeared in  George of the Jungle in 1997, she has also brought with it an unsettling trend - keeping the wild animals as pets.

As Crystal's popularity soared after appearing in Night at the Museum, The Hangover Part II and most recently in NBC's Animal Practice, she inadvertently sparked an epidemic of cruelty to thousands of monkeys.

The 20-year-old monkey became a household name when she appeared as Dexter in Night At The Museum with Ben Stiller and Ricky Gervais.