A 225-million-year-old fossil discovered in Africa is rewriting the story of how dinosaurs first emerged. The fossilized leg bone, belonging to a little-known group of reptiles called silesaurs, challenges long-standing beliefs about the size and evolution of the earliest dinosaurs and their closest relatives. A Forgotten Fossil Resurfaces The fossil was first unearthed in 1963 in what is now Zambia …
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