This is a critter that was in the zoology section of a crashed space ship in the TSR 'verse, (there's a bunch on that ship, many directly borrowed from sci-fi literature), anyhow I was thinking it became part of the Yazirian eco-system way back in history, so the Yazis think it was native. I was thinking of having the ship be all crashed on their home-world... by the time the exodus happens it's "extinct" but sample of it's hide exist, then shazam someone finds them native on another planet which then leads to tons of questions about how to define "the garden" if "native" mythic creatures live on other worlds does that mean the cosmos is the garden? Then some religious splintering and so on happens...