What Is A Dinosaur Dinosaurs are a diverse group of reptiles note 1 of the clade Dinosauria They first appeared during the Triassic period between 243 and 233 23 million years ago mya although the exact origin and timing of the evolution of dinosaurs is a subject of active research
Dinosaur clade Dinosauria the common name given to a group of reptiles often very large that first appeared roughly 245 million years ago near the beginning of the Middle Triassic Epoch and thrived worldwide for nearly 180 million years What makes a dinosaur a dinosaur There are several ways of answering this question some more accurate and useful than others A popular but very inaccurate definition calls any big extinct reptile like animal a dinosaur This would include everything from the sail backed mammal cousin Dimetrodon to marine reptiles to flying pterosaurs
What Is A Dinosaur
What Is A Dinosaur
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Dinosaurs have fascinated kids and adults alike since the very beginning of the discovery of their existence Their habits characteristics and even their appearance are still a mystery which naturally makes them that much more interesting Get to know the different types of these reptiles that dominated the Earth before mammals here The prehistoric reptiles known as dinosaurs arose during the Middle to Late Triassic Period of the Mesozoic Era some 230 million years ago They were members of a subclass of reptiles called the
Dinosaurs are a diverse group of mostly land based animals that are related to today s reptiles and birds In fact while dinosaurs are commonly seen as extinct and known only by their fossils paleontologists technically include modern birds as a surviving group of avian dinosaurs Dinosaurs those that are extinct and living birds are part of the evolutionary tree of amniotes The first amniotes were primitive four legged reptiles from which all other reptiles and mammals evolved
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In evolutionary terms dinosaurs were the land dwelling descendants of the archosaurs egg laying reptiles that survived the Permian Triassic extinction event 250 million years ago Technically dinosaurs can be distinguished from the other animals descended from archosaurs pterosaurs and crocodiles by a handful of anatomical quirks Dinosaurs were a specialized group of land reptiles that lived during the Mesozoic Era also called the Age of Dinosaurs The Mesozoic was the period of time between 252 million and 66 million years ago
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https://en.wikipedia.org › wiki › Dinosaur
Dinosaurs are a diverse group of reptiles note 1 of the clade Dinosauria They first appeared during the Triassic period between 243 and 233 23 million years ago mya although the exact origin and timing of the evolution of dinosaurs is a subject of active research
https://www.britannica.com › animal › dinosaur
Dinosaur clade Dinosauria the common name given to a group of reptiles often very large that first appeared roughly 245 million years ago near the beginning of the Middle Triassic Epoch and thrived worldwide for nearly 180 million years
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What Is A Dinosaur - Dinosaurs are a diverse group of mostly land based animals that are related to today s reptiles and birds In fact while dinosaurs are commonly seen as extinct and known only by their fossils paleontologists technically include modern birds as a surviving group of avian dinosaurs
