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| Description: Fossilized footprint of a theropod, a name that means “beast foot.” This group of carnivorous dinosaurs, which includes the familiar Tyrannosaurus rex, arose about 250 million years ago. Modern birds are descended from them. Picture Stats: Views: 322 Filesize: 840.13kB Height: 1025 Width: 1500 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=48572 |