1Arachnids can be found in almost every part of the world. They are incredible creatures that range in size from too small to see to as big as a dinner plate. Find out about what makes an arachnid an arachnid, learn about some of the incredible things they do, and meet some extreme arachnids! Arachnids 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.