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Ornithischia
Dinosaurs can be classified into two groups, based on the arrangement of their hip bones. One group, named Ornithischia, is characterized by the pubic bone being parallel with the ischium, both pointing backward. The example in the photo shows the ornithischian arrangement of the pelvic bones (articulated with femurs and vertebral column) of an Edmontosaurus skeleton, on display at the Denver Museum of Nature and Science.