Despite what you’ve seen in the movies, dinosaurs probably didn’t roar. And they may have come in a rainbow of colors.
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Fossil evidence of the avian vocal organ from the Mesozoic: https://www.nature.com/articles/nature19852
A bony-crested Jurassic dinosaur with evidence of iridescent plumage highlights complexity in early paravian evolution: https://www.nature.com/articles/s41467-017-02515-y
A large, short-armed, winged dromaeosaurid (Dinosauria: Theropoda) from the Early Cretaceous of China and its implications for feather evolution: https://www.nature.com/articles/srep11775
More about melanosomes from the University of Bristol's Palaeobiology Research Group: http://palaeo.gly.bris.ac.uk/Melanosomes/modernbirds.html
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