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A man holds his child to look at the mechanical T-Rex Dinosaur on National Dinosaur Day at the St. Louis Science Center in St. Louis on Thursday, June 1, 2023. Dinosaurs lived millions of years ago and were reptiles and ancestors of the common lizards, snakes, turtles, and crocodiles that exist today. Dinosaurs lived during the Mesozoic era or Age of Reptiles, which started about 252 million years ago. Photo by Bill Greenblatt/UPI

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