All humans are created with a small tail that is later absorbed by the body and developed into the tailbone. In some rare cases, small amounts of tissue are left hanging on the tailbone area of the body. Most often, the small piece of skin contains no bones, but does contain nerves and blood vessels. In some rarer cases, there are up to five vertebrae in the small tail – resulting in a true human tail or vestigial tail.
The longest known tail is 13 inches long and belongs to a man in India.