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The biggest dinosaur is probably ultrasauros. We only have a few bones of this late Jurassic (140 million years ago) plant-eater from Colorado, but the bones show an animal who was six-stories high and may have weighed more than 50 tons. A four-legged plant-eating dinosaur found recently in Argentina, argentinasaurus, may have been even heavier than ultrasauros. If it was a brachiosaur like ultrauros then it probably was the biggest, but if it was a titanosaur, another kind of big plant-eater common in South America, it wouldn't have been so bulky.

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15y ago

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