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Dinosaurs
are animals that dominated the terrestrial ecosystem for over 100 million years. Non-avian dinosaurs became extinct 65 million years ago (Mya) at the end of the Cretaceous period.
(From Wikipedia, the free encyclopedia.)
Sue - largest preserved Tyrannosaurus Rex Field Museum - Chicago Photograph by Cybrary Man
are animals that dominated the terrestrial ecosystem for over 100 million years. Non-avian dinosaurs became extinct 65 million years ago (Mya) at the end of the Cretaceous period.
