2. Anatomical preservational bias

• Theropods typically have light, hollow bones

• Sauropodomorphs and ornithischians usually have heavy, solid bones (except sauropod vertebrae)

  • => Theropods should be preserved less often than other dinosaurs

• But we observe more theropod genera than sauropodomorphs or ornithischians

  • => There must be other factors that outweigh this one.

Notes: