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The heaviest dinosaur that likely has accurate weight estimates is the Argentinosaurus, a sauropod which weighed 73 tons. Argentinosaurus is also the longest known dinosaur, at 98 to 118 feet in length. It is unknown whether Argentinosaurus held its neck upright like Sauroposeidon or horizontally like Diplodocus, so determining which dinosaur was the tallest is difficult. Sauroposeidon, also a sauropod, is known to have held its neck upright, making it 56 feet tall and thus the tallest dinosaur according to current scientific knowledge.

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