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Hair and feathers are preserved in fossils. That’s how we know dinosaurs have feathers.
But how about fat? Could they have been chunky like penguins?
This is actually a problem https://www.buzzfeednews.com/article/natashaumer/dinosaur-animals
those artists tend to base their drawings on the fossils alone, while ignoring what the animal might have looked like with layers of fat and other things.
That’s not true. They are modeled that way since they are reptiles and that’s the fat proportion of reptiles.
But than again they are related to birds so we don’t know
Karenosaurus
We know that they have feathers, you should ask question how, if they are not preserved…