Boa constrictors have tiny pelvic girdles and leg bones inside their bodies. Because these structures are nonfunctional "evolutionary baggage," they are called

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Vestigial structures are remnants of organs or structures that had a function in an early ancestor but are now reduced or nonfunctional. Boa constrictors' pelvic girdles and leg bones are examples of such structures.

Boa Constrictors Have Tiny Pelvic Girdles and Leg Bones Inside