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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We dont, but its very educated guesses that comes from looking at their descendants such as birds and reptiles. The paleonthogical society has agreed on a lot of things, and those things are whats most commonly taught and shown.
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