Polydactyly

[conuly]

Apparently, this can be caused for no reason, or as part of a genetic disorder, or as part of an inocuous dominant gene. The extra digits are either useless or not. It is considered one of the more common birth defects.

Interesting.

Comments

[firingneurons.livejournal.com]

My youngest brother had three extra toes when he was born. Fully functional too! It was cool, till he got them removed.