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The simplest answer would be to not have the legs fused at all. Underwater they would hold the legs together and swim using long flippers/flukes on the end. On land they would curl up the flippers/...
Answer
The simplest answer would be to not have the legs fused at all. Underwater they would hold the legs together and swim using long flippers/flukes on the end. On land they would curl up the flippers/...