Dinosaurs - presentation

• Dinosaurs are a group of reptiles that dominated the land for over 140 million years (more than 160 million years in some parts of the world).
• They evolved diverse shapes and sizes, and were able to survive in a variety of ecosystems.
• They had an upright stance, with legs perpendicular to their body. This is the main feature that sets dinosaurs apart from other reptiles.
• Like other reptiles, they laid eggs.
• Dinosaurs had two holes behind the eye socket. Large, strong jaw muscles went through the holes to attach directly to the top of the skull. As a result, the jaws were able to open wide and clamp down with more force.
• The upright stance allowed dinosaurs to use less energy to move than other reptiles that had a sprawling stance like today's lizards and crocodiles.
• With their legs positioned under their bodies rather than sticking out to the side, dinosaurs' weight was also better supported.
One of the largest dinosaur
• Although estimates vary, one of the contenders for the largest dinosaur is the Argentinosaurus.
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