How do we know what dinosaurs look and sound like?
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For looks we can infer the shape of them from bones. If a bone is whatever size and thickness we can infer the muscles attached to it were whatever size, so we can work out the probable shape of the dinosaur from that. There are grooves on bones for tendons so we can work out where the muscles attached and how the muscles would have moved so from that we can calculate the angles the legs moved at etc.
For the skin, we have some impressions of the skin and we can extrapolate from that. Same with the feathers.
For what they sound like, that’s a bit less certain. We can assume the probable size of the larynx from the size of the bones around it, so we can assume a big larynx gives a deep sound and small gives a high pitched. But mostly it is a guess based on similar animals, birds and reptiles, alive now.
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