The discovery of a new dinosaur specie, Kulindadromeus zabaikalicus, appears to indicate that almost all dinosaurs were covered in feathers.
"But the new Siberian fossils are the best example yet that some ornithischian [beaked] dinosaurs had feathers, so it wasn't only the theropods that had downy coats," Brusatte says.
"This does mean that we can now be very confident that feathers weren't just an invention of birds and their closest relatives, but evolved much deeper in dinosaur history," he adds. "I think that the common ancestor of dinosaurs probably had feathers, and that all dinosaurs had some type of feather, just like all mammals have some type of hair."
Even so, Godefroit suggests that the largest dinosaurs likely had the fewest feathers, as they wouldn't have needed them for insulation. "Just like elephants in Africa don't need fur," he says.
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