Blue Whales: The Most Enormous Creatures on Earth

The blue whale (Balaenoptera musculus) is the largest animal known to have existed in history. These enormous marine mammals have been known to reach up to 110 feet (34 meters) long, and the largest individuals likely weigh at least 150 tons (136 metric tons), according to the National Oceanic and Atmospheric Administration (NOAA) Fisheries. That's a little more than twice the length of a school bus and more than three times the weight of a semitrailer truck.

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