It wasn't the Seismosaurus. At 150 feet (46 meters) long, the Seismosaurus was the longest animal ever. It wasn't the Ultrasaurus. That dinosaur was taller than a sex-story building. No, the world's biggest dinosaur was the Argentinosaurus. Scientists found remains of this dinosaur in Nequen Province of Patagonia, Argentina. It was 110 feet (36 meters) long and weighed 100 tons (90,700 kilograms). That's heavier than twenty elephants.
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