Dinos

__//**Dino**//____**s**__
__//**By: Saranya M **//__

//**Birds are magnificent creatures. Do you know about their ancestors,the dinosaurs? There was an era (a long time ago) called the Mesozoic era. In the Mesozoic era, there were 3 time periods. The Triassic came first. Then came the Jurassic. And last came the Cretaceous. A dinosaur named Plateosaurus, lived in the Triassic. Archaeopteryx lived in the Jurassic. Finally in the Cretaceous, the T-Rex lived. Some other types of dinosaurs are Allosaurus, Dinonecus, Teranadons, Eoraptor, and Giginatosaurus. Dinosaurs are reptiles. Some are bipeds (have 2 legs), and some are quadrupeds (have 4 legs). **//

//**A pterosaur is a flying dinosaur. Some pterosaurs are pteranadons, pteradactals, quetzacoatlus,hatzegopteryx, and nemicolopterus. Pterosaurs are sometimes referred as dinosaurs, but that’s wrong. Dinosaurs are a certain group of reptiles with an upright stance. That means that they exclude pterosaurs, and groups of extinct water such as ichthyosaurs, mosasaurs, and shonisaurus. It is predicted that all dinosaurs became extinct 61 million years ago, which is shortly after the Cretaceous time period. No one really knows how dinosaurs got extinct, but some scientists think that an Asteroid (powerful, big meteorite) hit Earth. We only know for sure that dinosaurs started slowly dying off after whatever happened. There are still many other theories though that people agree, and disagree with. **//

//**Meat eating dinosaurs are called carnivores. Plant eating dinosaurs are called herbivores, and plant and meat eating dinosaurs are called omnivores. Most humans are omnivores. Some are herbivores. A T-Rex was a carnivore, a Triceratops was a herbivore, and a Troodon was a omnivore. **//