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Blue whales are the largest animals on Earth, known for their massive size and distinctive blue-gray coloration. They are baleen whales, meaning they have plates in their mouths used to filter out krill and other small shrimp-like creatures from the water. Blue whales can grow up to 100 feet in length and weigh as much as 200 tons. They are found in oceans around the world and are known for their loud, low-frequency vocalizations that can be heard over long distances. Blue whales are an iconic species that are highly valued for their beauty and importance to marine ecosystems.