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The Blue Whale is the largest animal ever known to have existed, with adults reaching up to 100 feet in length and weighing as much as 200 tons. As a member of the marine mammal family, these whales are warm-blooded, breathe air, and nurse their young with milk. They are characterized by their distinctive mottled blue-gray color and their long, slender bodies. Blue Whales can be found throughout the world's oceans, but they tend to prefer colder waters. They feed primarily on krill, consuming several tons of the tiny shrimp-like creatures each day during the feeding season. Despite being a protected species, Blue Whales are still at risk due to threats such as ship strikes and climate change. As a member of the Whale subcategory under Mammals Types within Marine Mammals, they are an incredible example of the diversity and adaptability of life in our oceans.