Chances are you’ve heard that our world is different than any other known in the universe. But did you know that’s because animals make it so? No? Well, where else do birds fly in the sky, fish swim in the sea, and oodles of other animals walk, run, and crawl over the land? Our world is animals’ only known romping and stomping ground. What’s more, as animals romp, stomp, tromp, eat, poop, and fart—and work for people—they are changing the world as we know it right under our noses. Sound far-fetched? Animals have changed the world since they first set foot, paw, and claw on Earth. Long ago, the ancient ancestors of animals and all living things, microbes called bacteria, created an atmosphere on Earth that allowed life to thrive and evolve into the animals, plants, and people you know today. Get set to discover all this and more in my book of animals that changed the world.