Those marine mammals most adapted to a marine existence are the

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Cetaceans, which include whales, dolphins, and porpoises, are the most adapted to a marine existence. They are fully aquatic and have evolved specialized adaptations for swimming and diving in the ocean, such as a streamlined body shape, flippers or flukes for propulsion, and a blowhole for breathing. Pinnipeds (seals, sea lions, and walruses) and sea otters are semi-aquatic and still rely on land for resting and mating, while sirenians (manatees and dugongs) are less adapted for long-distance swimming and are limited to shallow, coastal waters.

Those Marine Mammals Most Adapted to a Marine Existence Are