All tetrapods have five fingers – we inherited this from a common ancestor. Some of the earliest tetrapods had as many as 8 fingers, but they lost them throughout the years, and evolutionary scientists say that once a digit has been lost, it cannot be regrown.
Some people have a genetic malformation called polydactyll that results in more than five fingers or toes on one or more hands or feet. It is common among carriers of the genetic malformation to have an extra digit but at times people can have many more, including small fingers that come off from another finger.
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