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There's no way of knowing for sure
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this post was submitted on 03 Nov 2023
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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
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
Pterosaurs also independently from mammals evolved a form of hair.