By: Mario Novalbos
Dinosaurs are extinct reptiles that appeared for the first time on earth around 230 million years ago in the Triassic period. At first, they were small like cats and in the lowest part of the food chain. They populated the earth for more than 200 million years, while humans have only been on this planet for 1.5 million years. Incredible, isn’t it?
Dinosaurs could be classified into theropods, braquiopods and ornitopods and they could have cold or hot blood. They could be carnivores, herbivores or omnivores, like animals of our time.
The word “dinosaur” means “terrible lizzard” in Greek. Today we believe that dinosaurs are direct ancestors of birds. The largest dinosaur was the Argentinosaurus, with more than 40 meters. The one with the largest teeth was the Tyrannosaurus, with teeth as long as a human being. The smallest dinosaur was the Epidermiosaurus, only 1.5 cm long. The biggest predator was the Spinosaurus, that was 18 meters long.