Scientists find oldest dinosaur -- or closest relative yet

Researchers have discovered what may be the earliest dinosaur, a creature the size of a Labrador retriever, but with a five foot-long tail, that walked the Earth about 10 million years before more familiar dinosaurs like the small, swift-footed Eoraptor and Herrerasaurus. The findings mean that the dinosaur lineage appeared 10 million to 15 million years earlier than fossils previously showed.

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