Glossary
Revealing Paws

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Vestigial
Remaining as a remnant or trace of a structure that had been present in the ancestors of a species.
Often the original functionality is (to some degree) now lacking, and the structure has become rudimentary or degenerate.
e.g. dew claws

Dog Paw Illustrating Dew Claw

Dog Paw with Dew Claw