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Marine mammals are a diverse group of aquatic animals that have adapted to life in the ocean. They are warm-blooded vertebrates that breathe air, give birth to live young, and nurse their offspring with milk. Marine mammals include whales, dolphins, porpoises, seals, sea lions, and walruses. These animals have a variety of adaptations that allow them to thrive in their watery environment, such as streamlined bodies for efficient swimming, flippers for propulsion, and blubber for insulation. Marine mammals play important roles in ocean ecosystems and are valued for their intelligence, beauty, and cultural significance.