Diplodocus is one of the best-known sauropod dinosaurs. It had the typical long neck, long tail, and stood on four pillar-like legs. The forelimbs were slightly shorter than the hind limbs, resulting in a largely horizontal posture. Diplodocus could reach up to 25 m in length, and it weighed about 15 t. The neck and teeth were unique among the sauropods that it lived alongside. This allowed them to fill separate niches by eating different types of vegetation, and avoid competing. Diplodocus most likely browsed at relatively low levels, as opposed to its contemporary Camarasaurus, which held its neck more vertically.
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