Whale-Tail and Seal-Legs in One Animal

...and all four legs modified into flippers for pinnipeds that feed in the water but breed on land.

So as you can see, many marine mammals have one form or another, but why not both? Couldn't a semi-aquatic mammal have a long, strong tail alongside its modified hindlegs? (Granted, the hindlegs would be smaller, but the point still stands.)

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Whale-Tail and Seal-Legs in One Animal

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