Dinosaur hip groups · seed 1 · A4, ink-friendly. The answer key prints on its own page for grown-ups.
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Lizard hips and bird hips

Science · Dinosaurs & Paleontology · ages 9-11
Name ______________________   Date ____________

  1. Which body part gives the traditional dinosaur hip groups their names?

    • Hip bones
    • Teeth
    • Neck length

  2. What are the names of the two traditional dinosaur hip groups?

    • Meat-eaters and plant-eaters
    • Saurischia and Ornithischia
    • Big dinosaurs and small dinosaurs

  3. Ornithischia means "bird-hipped."

    Circle one:   True   False

  4. Which traditional dinosaur hip group includes Triceratops?

    • Ornithischia
    • Saurischia
    • Neither group

  5. T. rex is a theropod. Which traditional dinosaur group includes theropods?

    • Ornithischia
    • Both hip groups
    • Saurischia

  6. Stegosaurus ate plants. T. rex ate meat. Using their names and the lesson's examples, how should you sort them into the traditional hip groups?

    • Both belong to Saurischia because food decides the group
    • They belong to different hip groups
    • Neither has a hip group because they ate different foods

  7. A dinosaur fossil has a backward-pointing pubis. A learner says this proves it belongs to Ornithischia. Which conclusion is supported?

    • More features are needed to identify its group
    • The backward-pointing bone proves it belongs to Ornithischia
    • The backward-pointing bone proves it belongs to Saurischia

  8. Sam puts Brachiosaurus in Ornithischia because it ate plants like Triceratops. Which fact corrects his sorting?

    • Every plant-eater belongs to Ornithischia
    • Brachiosaurus has no traditional hip group
    • Brachiosaurus belongs to Saurischia
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Answer key

For grown-ups. Fold this page away before handing over the rest.

Lizard hips and bird hips W1-mt_yrSdVrXrsF-s1

  1. Hip bones · The names 'lizard-hipped' and 'bird-hipped' refer to hip structure. They do not describe teeth or neck length.
  2. Saurischia and Ornithischia · Saurischia and Ornithischia are the traditional hip groups. The other choices sort dinosaurs by food or size.
  3. True · Ornithischia means 'bird-hipped.' This is the meaning of the group name, not a claim that its members were birds.
  4. Ornithischia · Triceratops belongs to Ornithischia, the group whose name means 'bird-hipped.'
  5. Saurischia · The lesson places theropods, including T. rex, in Saurischia.
  6. They belong to different hip groups · Stegosaurus belongs to Ornithischia. T. rex belongs to Saurischia. These examples show they belong to different groups. Different foods alone would not tell us that.
  7. More features are needed to identify its group · Some saurischians also had a backward-pointing pubis. Scientists need more features to identify this fossil's group.
  8. Brachiosaurus belongs to Saurischia · Brachiosaurus belongs to Saurischia even though it ate plants. Sharing a diet with Triceratops does not put them in the same hip group.
Worksheet · LightMySky