Hi! I am looking for a book that my son adored as a child, but neither of us can remember the title or author. It was an illustrated book about a mythical land with strange creatures: snake-like reptiles that coiled into circles to roll downhill and sometimes blew a flat, zebra/horse creatures that had to walk backwards, because their knees bent the wrong way. That’s all I can remember. I hope someone else knows it! Thank you!