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What is this?

Explore the fascinating world of dinosaurs, the ancient reptiles that lived during the Jurassic Period. Learn about their bird-like features, hollowed bones, and large brains. Discover what makes an animal a dinosaur, including their distinctive characteristics like underslung legs, hollow hip sockets, and forward-pointing knees. Dive into the realm of pterosaurs and mosasaurs, other ancient reptiles that roamed the Earth. Uncover the secrets of these incredible creatures and their evolutionary adaptations.

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What is this?

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  1. What is this?

  2. Dinosaur-like • Has teeth • Has a tail • Lived in the Jurassic Period

  3. Bird-like • Feathers (and flight?) • Hollowed bones • Large brain

  4. What makes and animal a dinosaur? • underslung legs that gave dinosaurs an erect posture • a large hole in the bottom of their basin-shaped hip-socket • a secondary palate (uncharacteristic of reptiles) that permits dinosaurs to eat and breathe at the same time • a fairly straight thigh bone with an in-turned head • two pairs of holes in the temporal region of the skull (diapsid skull)

  5. Continued… • backward-pointing knees (or elbows) of the front legs • forward-pointing knees of the rear legs (rather than pointing sideways) • front legs shorter and lighter than the rear legs (in almost every case) • a special bone (predentary) at the chin that capped the front of the bottom jaw in some dinosaurs (the ornithischians) • land-dwelling creature, rather than marine or airborne

  6. Ancient Reptiles • Pterosaurs (Flying reptiles) • Mosasaurs (Marine reptiles)

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