This means some species of dinosaur existed millions of years apart! Not all dinosaurs lived throughout the entirety of the Mesozoic Era. Dinosaurs went extinct at the end of the Cretaceous period, though many scientists will argue that today’s birds are dinosaurs. This was when the Tyrannosaurus rex and the Triceratops lived. The Cretaceous period lasted from 145 to 65 million years ago. This was when species such as the Stegosaurus and the Brontosaurus lived. The Jurassic period occurred around 200 to 145 million years ago. The end of the Triassic period was when dinosaurs first started to appear. Cretaceous (145 to 65 million years ago).Jurassic (200 to 145 million years ago). They lived during the Mesozoic Era, which can be broken down into three periods: A good example is the well-known Mosasaurus. Some early reptiles that lived in the Mesozoic Era are actually thought to be dinosaurs by many people. In fact, dinosaurs used to be categorized in the phylum Chordata which includes reptiles. They fall outside of the class Reptilia, but are considered to be reptiles ( or at least closely related) by many scientists They are not mammals, but they are closely related to birds and reptiles. This Kingdom includes humans, other mammals, birds, fish, bugs, reptiles, and many more. Like all animals, dinosaurs belong to the kingdom Animalia. Dinosaurs are very similar to many of today’s reptiles and birds.
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