"I didn’t even notice then that it had more than the usual number of toes"

Left foot with postaxial polydactyly of 5th ray
GNU Free Documentation LicenseLeft foot with postaxial polydactyly of 5th ray - Credit: Magnus Manske
Polydactyly, from the Greek meaning ‘many digits’, refers to a congenital developmental abnormality that results in humans being born with more than the normal number of fingers and and/or toes.

Mutations in the gene LMBR1 have been associated with polydactyly in humans and animals.