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The Blue Whale is the largest animal ever known to have existed, reaching lengths of up to 100 feet and weights of as much as 200 tons. They are found in all oceans except the Arctic, and prefer deep, open waters. Their diet consists mainly of krill, which they filter out of the water using their baleen plates. Blue Whales are easily recognizable by their long, slender bodies and mottled blue-gray coloration. They are also known for their distinctive calls, which can be heard for miles and play a crucial role in their communication and mating behaviors. Unfortunately, Blue Whales were hunted to the brink of extinction during the 20th century, primarily due to commercial whaling. Today, they are classified as endangered under the Endangered Species Act and are protected by international law. Conservation efforts have helped to stabilize their populations in some areas, but they remain vulnerable to threats such as climate change, pollution, and ship strikes.