@gardenturtle: I am also a proud owner of a Chinchilla. Chinchillas are known to have the highest fur density of any other land animal. They have more than 20,000 hairs per square centimeter. Their fur is so extremely dense that parasites such as fleas cannot live on them. They suffocate.
Humans grow one hair from each hair follicle, the chinchilla has more than fifty hairs from one follicle.