this has been known for while; from the bones you can tell where the muscles attached, which can tell you the form of the trachea, which can tell you roughly the sound range. And yeah, none of them we know of roared. Roaring is a horrible hunting technique anyway. Hi' I'm a T-Rex wit my boys a mile over here... It sounds cool in Jurassic Park, but for all practical purposes it makes zero sense. Now... something like a Parasaurolophus honking? That makes sense.
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