On the cover you can actually see a seawing (likely Turtle from the looks of it) swimming in the pool in Jade mountain. The Seawing blends in so well many people may not have noticed them on the cover.People may not have noticed because of another reason though. Such as being mostly covered by the bar code or being cut off by the edge of the book.
On the far left there are crabs. Which is interesting given that they are in a cave on a mountain far from any beach. Though it possibly means the underground pool connects to the ocean somewhere like the stream in the Dragonets of Destiny cave did.Very small and hard to see but they are there.
As said in the first chapter there are Axolotl too, though depending on the cut of the book you may not see the one on the far right.
I have them boxed in the main image if you want to check for yourself where they are.
The cover is in fact the entrance to Jade mountain although it is at night.It is a very large entrance.
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Wings Of Fire Facts
RandomThings you may not have noticed on covers of the books, facts about how characters are described, and some inconsistencies or interesting things we learn from the comics