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天宇龍 Tianyulong just one case,but not must be normal. And, Tianyulong is living in Late Jurassic. I'm not sure isn't heterodontosauridae ancestors already had this feature.
Moreover, another kind of ornithopod--Psittacosaurus, winthout feathers structure in fact.....
I still suspect that Ornithopod had quill-like structures is just a special case, looking forword more fossils evidence.
nice details