The French have organized these creatures into three separate categories. The first group consists of animals such as the unicorn or two-headed gorgon which have an extra limb, head or projectile. The second group has a missing limb or body part.
十八世紀法國畢梵伯爵，曾對妖怪做了簡單的分類，他將它們分為三種﹘﹘軀體過剩、欠缺，或部位顛倒、誤置都算是典型的妖怪。