+Marine mammals are a diverse group of [Mammals](/wiki/mammal) that have adapted to life in the ocean. These remarkable creatures, from vast whales to playful seals, spend most or all of their lives in aquatic environments, yet they still breathe air and give birth to live young. They play crucial roles in [Marine Ecosystems](/wiki/marine_ecosystem) worldwide.
+## See also
+- [Whale](/wiki/whale)
+- [Dolphin](/wiki/dolphin)
+- [Seal](/wiki/seal)
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