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The animal with the greatest hair density is not the mouse. Not the persian cat either. Perhaps unsurprisingly, it is the chinchilla. With more than 40,000 hairs per square inch chinchillas have the highest fur density of any animal. Their fur is so dense that skin parasites (such as fleas) cannot live on one because they would suffocate. Whereas humans grow one hair from each follicle, a chinchilla produces more than fifty hairs from a single follicle!
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