How do we know what dinosaurs look and sound like?
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For looks we are finding more and more information. We have found skin imprints for Velociraptors, so we know they had feathers. We have some skin imprints for T Rex, so we know they didn’t have feathers, as least for most of the body.
A famous “mummified” armored dinosaur shows us nearly everything in great detail, at least for that species.
We are even starting to learn about colors! Some feather impressions still had some pigment remaining, revealing that a few species had reddish-brown, white and black feathers.
For sounds we are guessing more. Some dinosaurs had crests; assuming these were used for vocalization we can model how they would sound. Using birds as a reference we can guess at more sounds.
So we learn more all the time. Some well preserved fossil is discovered and we can learn a lot quickly.
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