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What is this?. Dinosaur-like. Has teeth Has a tail Lived in the Jurassic Period. Bird-like. Feathers (and flight?) Hollowed bones Large brain . What makes and animal a dinosaur?. underslung legs that gave dinosaurs an erect posture

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Dinosaur like l.jpg
Dinosaur-like

  • Has teeth

  • Has a tail

  • Lived in the Jurassic Period


Bird like l.jpg
Bird-like

  • Feathers (and flight?)

  • Hollowed bones

  • Large brain


What makes and animal a dinosaur l.jpg
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)


Continued l.jpg
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


Ancient reptiles l.jpg
Ancient Reptiles

  • Pterosaurs (Flying reptiles)

  • Mosasaurs (Marine reptiles)


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