Description Mammals can be found all around the world. From the fierce lion to the tiny mouse, these animals all seem very different. Now you can learn what they all have in common and discover how to spot a mammal.. . Mammals is part of Decodables by Jump!, a comprehensive library of decodable leveled readers that follow a sequenced approach to phonics instruction. Young readers will enjoy colorful, photo-packed nonfiction as they follow a prescribed format supported by the science of reading that encourages reading development.