6 Fingers (Polydactylism): Why Are Some People Born With An Extra Digit?

In most cases of polydactyly, the extra finger is just a lump of tissue without bones, ligaments or tendons, making it unable to move independently.
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Customer came in and let me take a picture of her hands that had 6 fingers on each : r/mildlyinteresting

Polydactyly Arnold Zwicky's Blog

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Augmented manipulation ability in humans with six-fingered hands

Fingers and Toes: Presentations of Polydactyly

Is polydactyly a good omen or bad? - MEDizzy Journal

It's natural, but an extra finger will still draw attention: Ethically speaking

Polydactyly International Center for Limb Lengthening

Polydactyly: Symptoms, causes, and treatments

Polydactyly

Polydactyly: Symptoms, causes, and treatments