Dinosaur, the common name given to a group of reptiles, often very
large, that first appeared roughly 245 million years ago and thrived
worldwide for nearly 180 million years. Most died out by the end of the
Cretaceous Period, about 66 million years ago The name dinosaur comes
from the Greek words deinos (“terrible” or “fearfully great”) and sauros
(“reptile” or “lizard”).
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