Giant Dinosaurs #1 Dinosaurs were reptiles that lived on Earth from about 230 million years ago to about 65 million years ago. #2 Dinosaurs lived during a period of Earth’s history called the Mesozoic (“middle life”) Era. They lived during all three periods of this era: the Triassic, Jurassic, and Cretaceous. #3 Meat-eating dinosaurs are known as theropods, which means “beast-footed,” because they had sharp, hooked claws on their toes. In contrast, plant-eating dinosaurs tended to have blunt hooves or toenails. #4 No one knows exactly how long a dinosaur’s lifespan was. Some scientists speculate some dinosaurs lived for as long as 200 years. #5 Dinosaur skulls had large holes or “windows” that made their skulls lighter. Some of the largest skulls were as long as a car.
Posted on: Thu, 12 Sep 2013 05:37:54 +0000
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