Diplodocus,discovered in 1877,is one of the longest known dinosaurs,reaching a length of 35 metres (115 ft) or so. Most of that,however,was tail and neck,meaning that the animal only weighed 10 to 15 tons - much less than the bulkier sauropods of similar length,such as brachiosaurus. Diplodocus lived in the Jurassic period,around 155 to 148 million years ago,in what is now North America | |
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