Polydactyl cat
A polydactyl cat is a cat with a congenital physical anomaly called feline polydactyly (also known as polydactylism or hyperdactyly), which causes the cat to be born with more than the usual number of toes on one or more of its paws. A point mutation in the noncoding region of the ZRS regulatory sequence causes abnormal SHH expression during limb development, causing variable polydactyly through following developmental processes rather than the mutation alone, explaining why the phenotypic expression of polydactyly varies.