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Revision as of 02:28, 25 August 2004 by ShaunMacPherson (talk | contribs)(diff) ← Previous revision | Latest revision (diff) | Newer revision → (diff)A hair ball is a collection of hair or fur formed in the stomach of animals that is ocasionally vomited up when it becomes too big. Cats are especially prone to hair ball formation since they groom themselves by licking their fur leading to hair going into the stomach.