Hede.io Entry: Dinosaurs
Dinosaurs are a diverse group of
reptiles that first appeared during the
Triassic period of Earth's history between 243 and 233 million years ago. The exact origin and timing of dinosaur
evolution is the subject of current
research. Dinosaurs are represented on every
continent by both descendant species of dinosaurs and
Triassic–Jurassic extinction event 201 million years ago dinosaurs became the dominant
vertebrates and remained dominant through the
Cretaceous periods. The
fossil record demonstrates that modern
birds are closely related to dinosaurs that evolved from earlier
theropods during the late Jurassic period. This means modern birds are the only known dinosaur lineage to have survived the
Cretaceous–Paleogene extinction event that occurred around 65 million years ago.
evolution dinosaurs can be divided into
avian (bird) dinosaurs and all other dinosaurs that are not avian.
Paleontologists have identified more than 1,000 different
species of dinosaurs.
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