who were the first dinosaurs?
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Approximately 230 million years ago, during the Triassic Period, the dinosaurs appeared, evolved from the reptiles. Plateosaurus was one of the first large plant-eating dinosaurs, a relative of the much larger sauropods.
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Just as you thought, the quick answer is yes, dinosaurs are reptiles. ... After all, dinosaurs lived in the Mesozoic Era – the 'Age of Reptiles', they had scaly skin, they hatched from eggs, and even the word 'dinosaur' means 'terrible lizard' (lizards being a kind of reptile).
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['Human.', 'Dodo.', 'Dilophosaurus.', 'Kairuku.', 'Oviraptor.', 'Lystrosaurus.', 'Compsognathus.', 'Mesopithecus.']
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Dinosaurs are in the reptile group, which includes turtles, crocodiles, birds, lizards, and snakes. Of these groups of animals, second to birds, crocodiles are probably the closest related to dinosaurs (though they are not considered modern dinosaurs themselves, unlike birds).
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Vertebrate Evolution. The earliest vertebrates were jawless fish, similar to living hagfish. They lived between 500 and 600 million years ago. They had a cranium but no vertebral column.
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Dinosaur researcher Michael D'Emic analyzes dinosaur bones. Dinosaurs were once thought to be the cold-blooded kings of the Mesozoic era. But new research on their growth rates suggests the prehistoric beasts grew just as fast as mammals, indicating they were warm-blooded creatures.
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['Megalosaurus (1676) Ghedoghedo/Wikimedia Commons/CC BY 3.0. ... ', 'Mosasaurus (1764) Ghedoghedo/Wikimedia Commons/CC BY 3.0. ... ', 'Iguanodon (1820) Ronny Mg/Wikimedia Commons/CC BY 1.0. ... ', 'Hadrosaurus (1858) andytang20/Flickr/CC BY 2.0. ... ', 'Archaeopteryx (1860-1862) ... ', 'Diplodocus (1877) ... ', 'Coelophysis (1947) ... ', 'Maiasaura (1975)']
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Neither birds nor bats, pterosaurs were reptiles, close cousins of dinosaurs who evolved on a separate branch of the reptile family tree. They were also the first animals after insects to evolve powered flight—not just leaping or gliding, but flapping their wings to generate lift and travel through the air.
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Fossils are found in a variety of rock formations dating to the Maastrichtian age of the upper Cretaceous period, 68 to 66 million years ago. It was the last known member of the tyrannosaurids, and among the last non-avian dinosaurs to exist before the Cretaceous–Paleogene extinction event.
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['Pachycephalosaurus.', 'Indominus rex.', 'Carnotaurus.', 'Mosasaurus.', 'Ankylosaurus.']
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Yes. In an evolutionary sense, birds are a living group of dinosaurs because they descended from the common ancestor of all dinosaurs. Other than birds, however, there is no scientific evidence that any dinosaurs, such as Tyrannosaurus, Velociraptor, Apatosaurus, Stegosaurus, or Triceratops, are still alive.
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['Carnotaurus. [02:46]', 'Pentaceratops. [03:57]', 'Indominus rex. [07:00]', 'Allosaurus. [10:47]', 'Deinonychus. [14:08]', 'Brachiosaurus. [14:52]', 'Spinosaurus. [16:56]']
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During this time, new groups of mammals and birds, as well as flowering plants, appeared. The Cretaceous (along with the Mesozoic) ended with the Cretaceous–Paleogene extinction event, a large mass extinction in which many groups, including non-avian dinosaurs, pterosaurs and large marine reptiles died out.
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['Dilophosaurus.', 'Tyrannosaurus rex.', 'Velociraptor.', 'Herrerasaurus (possibly a replacement for Baryonyx)', 'Compsognathus (possibly a replacement for Segisaurus)', 'Brachiosaurus.', 'Triceratops.', 'Gallimimus.']
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The first tetrapods — land-living vertebrates — appeared during the Devonian, as did the first terrestrial arthropods, including wingless insects and the earliest arachnids. In the oceans, brachiopods flourished. Crinoids and other echinoderms, tabulate and rugose corals, and ammonites were also common.
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In terms of major events, the Tertiary period began with the demise of the non-avian dinosaurs in the Cretaceous–Tertiary extinction event, at the start of the Cenozoic era, and lasted to the beginning of the most recent Ice Age at the end of the Pliocene epoch.
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T. rex was a very big meat-eating dinosaur, also called a carnivore. It would have been at the top of the food chain. It is known to have fed on other large dinosaurs, such as Edmontosaurus, Anatosaurus, and Triceratops, and probably could have swallowed smaller dinosaurs in a single bite.