![]() They were some of the largest land animals that ever existed, about 4.5 metres (15 feet) tall at the hips, with a length of up to 21m (70 feet) and a mass up to 35 metric tonnes (40 tons). Apatosaurus ( IPA: ), previously known as Brontosaurus, is a genus of sauropod dinosaurs that lived about 140 million years ago, during the Jurassic Period.
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