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Ok, here's mind-boggling fact one, for today. Not as boggling as avian respiration, but still....
Listening to a Dinos 101: Dinosaur Paleontology lecture:
"Most of the major subgroups of theropod dinosaurs have at least one species known to have been feathered. So there's a really good chance that almost all theropod dinosaurs had at least some feathers."
Tyranosaurus rex and Velociraptor both are theropods....................
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