Sauropoda /sɔːˈrɒpɵdə/, or the sauropods /ˈsɔrəpɒd/ (sauro- + -pod, "lizard-footed"), are an infraorder of saurischian ("lizard-hipped") dinosaurs. They had very long necks, long tails, small heads (relative to the rest of their body), and four thick, pillar-like legs. They are notable for the enormous sizes attained by some species, and the group includes the largest animals to have ever lived on land. Well-known genera includeBrachiosaurusDiplodocusApatosaurus and Brontosaurus.

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