Dinosaur Reference Book app for iPhone and iPad

Dinosaur Reference Book - great app for student and dinosaur lover.
Detail information of A-Z dinosaur race.
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Dinosaurs are a diverse group of reptiles[note 1] of the clade Dinosauria. They first appeared during the Triassic period, between 243 and 231 million years ago,[1] although the exact origin and timing of the evolution of dinosaurs is the subject of active research.[2] They became the dominant terrestrial vertebrates after the Triassic–Jurassic extinction event 201 million years ago; their dominance continued through the Jurassic and Cretaceous periods. The fossil record indicates that birds are modern feathered dinosaurs,[3] having evolved from earlier theropods during the late Jurassic Period.[4] As such, birds were the only dinosaur lineage to survive the Cretaceous–Paleogene extinction event 66 million years ago.[5] Dinosaurs can therefore be divided into avian dinosaurs, or birds; and non-avian dinosaurs, which are all dinosaurs other than birds.