Why does a whale have pelvic bones even though they don’t have legs?

scientists say the gradual shrinkage of the whales' hind limbs over 15 million years was the result of slowly accumulated genetic changes that influenced the size of the limbs (they used to have legs)

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Explanation:

Whale pelvic bones evolved to help the them maneuver better during intercourse. They have very small pelvic bones compared to their body Scientists have discovered that the tiny bones may actually play a huge role in whale reproduction.