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They include seals, sea lions, walruses, dolphins, porpoises, and whales. These animals have several adaptations that allow them to thrive in marine environments, such as streamlined bodies, blubber for insulation, and the ability to hold their breath for long periods of time. Marine mammals play important roles in marine ecosystems, serving as top predators and contributing to nutrient cycling. They are also of great interest to scientists and conservationists due to their unique biology and vulnerability to human activities. The Wikipedia page on marine mammals provides a detailed overview of these incredible creatures, including their evolution, physical characteristics, behavior, communication, and conservation status. It also discusses the various threats they face from pollution, climate change, habitat loss, and hunting. Overall, the page serves as a comprehensive resource for anyone interested in learning more about marine mammals and their crucial role in the marine ecosystem.