system
Given the following post, respond as if you're commenting on Reddit:
human
How do we know what dinosaurs' skin looked like?

Every depiction of dinosaurs shows them with leathery, reptilian like skin. Yet they say chickens are closely related to dinosaurs. How do we know dinosaurs didn't have feathers? Or fur? How do we know anything about their outer appearance from fossils alone?
gpt
Some dinosaurs died in mud. The soft material preserved their skin coverings, and we can see what it would have looked like from that. 

  
But, dinosaurs often *did* have feathers. You're working off a 1980-1990's impression of what they might have looked like.