The Curious Genetics of Werewolves Link
A nice look at Ambras syndrome.
The name Ambras comes from Petrus Gonzales, who at age 12 in 1556 was brought as a slave from Tenerife in the Canary Islands to the court in France. He had a strikingly hairy face, married young, and had 4 children, 3 of whom were born hairy. His daughter Tognina and son Arrigo passed on the trait. Royalty, who called Petrus the “man of the woods,” thought he represented a race of hairy people from the Canary Islands.