Fossil, yes, but how accurate was it? How did we know how their eyes looked like? How did we know they made that roaring sound? Their colors? How did we arrive to such a clear depiction of dinosaurs?
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Most of it is inferred from either the body structure we do know from bones, or from their still living descendants. We know how big eyes were from eye sockets. We know a good bit about muscle size and structure from the relative size of bones and joints. We know some things about sounds based on resonance chambers in the skulls of some dinosaurs, similar to how you could tell that a tuba makes lower notes than a trumpet without playing them.
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