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Omeisaurus was a genus of long-necked sauropod dinosaurs that lived in the Middle Jurassic, approximately 165 to 160 million years ago. At 14 m (45 feet) long and 4,000 kg, it was about the weight of an adult male elephant and was not as large as some of its truly gargantuan relatives. It lived in heavily forested environments and could have fed from the treetops using its long neck. Omeisaurus appears to be part of an Asian radiation of sauropods, originating during a time when this continent was in isolation (1). They are distinguished by their exceptionally long necks, with several more vertebrae than most other sauropod species. They likely traveled in herds (2).

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