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Discovery reveals where dinosaurs originated - LiveScience- msnbc.com

Much more recently, hikers stumbled across a few bits of bone at Ghost Ranch in New Mexico, leading to the discovery of a game-changing dinosaur that reveals where it all began.

The dinosaur, now called Tawa hallae, had a body that was only the size of a medium to large dog, but its remains have helped scientists shore up where dinosaurs came from.