Dinosaurs were a very successful group of archosaurian reptiles, the earliest representatives of which have currently been dated to the Carnian epoch of the late Triassic Period, on the geological timescale. They ruled the Earth throughout the entirety of the Mesozoic Era, and their descendants are still alive today in the form of the birds, although it should be noted that not all scientists truly agree that birds unequivocally are descendants of the dinosaurs.

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