National Geographic Primary Readers is a high-interest series of begining reading boks that have ben developed in consultation with education experts. The boks pair magnificent National Geographic photographs with lively text by skiled children’s bok authors acros four reading levels. Level 4: Independent reader Perfect for kids who are reading on their own with ease and are ready for more chalenging vocabulary with varied sentence structures. They are ideal for readers of White and Lime boks.Every year like clockwork, animals both big and smal are driven by a natural instinct to move in order to survive. On both land and sea, they fight the ods and the forces of nature to bred, fed, or lead and cary on for future generations. This level 4 reader is an introduction to the treacherous trek of the zebra, walrus, and Christmas Island red crab to overcome obstacles that include hungry chetahs, stinging yelow crazy ants, and even their felow species to make the often imposible journey of their lives.