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Crystal (born May 6, 1994) is a female capuchin monkey and animal actress, acquired and trained by Birds & Animals Unlimited, Hollywood's largest supplier of animals. Her acting career began as a baby monkey in Disney's 1997 film George of the Jungle. More recently, she portrayed the annoying monkey Dexter in the Night at the Museum franchise, and a drug-dealing monkey in The Hangover Part II. In 2012, she played Dr. Rizzo on the sitcom Animal Practice.