National Geographic Primary Readers is a high-interest series of beginning reading books thathave been developed in consultation with education experts. The books pair magnificent NationalGeographic photographs with lively text by skilled children`s book authors across four reading levels.Level 4: Independent readerPerfect for kids who are reading on their own with ease and are ready for more challengingvocabulary with varied sentence structures. They are ideal for readers of White and Lime books.Over the course of their 70-year lifespan, sperm whales will easily travel the circumference of theEarth in search of food and the need to breed and find a mate. Males will travel as far north as theBering Sea and as far south as Antarctica in order to find enough food to sustain their ways of live-up to 700 squid a day! Along the way, these massive beasts battle 30-feet- long giant squids, andeach other, to sustain their ways of life.