"Mmmmmmmaybe," Papyrus hedges, sharing no such conveniently discovered proficiency in Knowledge: Dragons. "But, what's different about silver dragons that they're good at changing shapes...?"

He's seen a couple dragony people around the islands in his time since waking up, enough to notice patterns. They're a range of colors, some vividly colorful, others more metallic. But like so many of the Animalians, they tend to be the sort to walk on two legs. And there haven't been many wings to speak of. So maybe thinking about the people isn't the trick here. What's special about silver, compared to those other colors or metals?

"Werewolves don't like silver, I think. And isn't silver used in old mirrors...?"