The Apatosaurus, which lived about 155 to 159 million years ago, is commonly called a Brontosaurus. The Apatosaurus is so famous because of its amazing size. They were about 70 to 75 feet long, so just imagine a seven story building turned on its side. Something that long was also probably pretty heavy – scientists guess weighed close to 20 tons! That puts Apatosauruses up there with whales and Eldritch monsters as one of the largest animals to ever exist. One interesting feature was their long tail that the Apatosaurus could have used like a bullwhip. According to computer calculations, they could whip their tail so fast that it broke the sound barrier, creating a sonic boom. Breaking the sound barrier creates a cannon-like boom that would have been heard for miles. While it wasn’t an effective weapon, it would have been used as a warning for nearby Apatosauruses, or way to scare potential predators.
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