Ever heard of polydactyly or polydactylism? It's such a cool condition!
I have never of that.  Tell me about it.
Well polydactyly is basically having supernumerary fingers or toes.
What does supernumerary mean?
Supernumerary means to have too many, like a person having 6 toes or fingers.
Oh wow, how common of a condition is that?
Well it isn't too common, but it is even less common on both hands or feet in humans or animals.
Do the extra appendages tend to look normal?
It is usually fairly normal, but they occasionally contain bone without joints.
Do you think there is an advantage to having an extra finger or toe?