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The whale is a marine mammal found many ocean areas from arctic and sub-arctic to warmer waters. Whales are best known for their size, which can be up to 110 feet long. The Blue Whale is the largest known mammal to ever live, up to 110 feet long and weighing 150 tons. The whale breathes air into its lungs through a blowhole on the top if its head. Play the following videos to learn more about the whale.