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Main characteristics dinosaurs share: 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. With the exception of some birds, for example penguins, dinosaurs lived on land, not in the sea. Their skull had a hole between the eye socket and nostril. This feature is shared by all archosaurs. Dinosaurs also 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. (责任编辑：) |