During Adolin's exploration of Urithiru (right before he murders Sadeas) he comes across a painting
A fanciful picture with animals from mythology. He recognized a few from children's stories, like the enormous mink like creature with the mane of hair that burst out around and behind its head. What was it called again?
Let's answer Adolin's question. Is that a lion. Does this mean that normal animals once inhabited Roshar but became extinct or were forced to adapt after the arrival of Odium or the Highstorms. Or maybe these were artist illustrations from stories brought over to Roshar by worldhoppers? What do you think?
With shardpools being a thing and worldhoppers like Hoid being a thing as well it's entirely possible that people brought stories of the fauna of their world with them when they came to Roshar. After all, we know (via Word of Brandon) that the Horneater lakes are shardpools so they could have knowledge of lions via travelers, seeing them in the pools or some other way (worldsingers?)
Edit-- just noticed you mentioned worldhoppers. I think that's what it is, but it could also be stories from the original inhabitants if (big if) the original inhabitants came from elsewhere in the Cosmere.
Edit again -- They might have gone extinct after the arrival of Odium. If the rest of the world was akin to Shinovar prior to Odium then it's entirely possible for their to have been lions, tigers, and bears (oh my!).
Unless someone asks (or has asked) Brandon then I have no clue.
[Brandon]can you aid us in our questions?
No, it seems like you're asking the right ones.