Every year like clockwork, animals both big and small are driven by a natural instinct to move, in order to survive. On both land and sea, they fight the odds and the forces of nature to breed, feed, or lead and carry on for future generations. This reader is an introduction to the treacherous trek of the zebra, walrus, and Christmas Island red crab to overcome obstacles that include hungry cheetahs, stinging yellow crazy ants, and even their fellow

Chocolate or vanilla? Creamy peanut butter or crunchy? Cats or dogs? On some matters in life, every kid must take a stance. Ever since the first youngster in history had a pet, cats vs. dogs has been a hotly debated issue at recesses and lunch tables worldwide. Which one's better? Smarter? This reader presents the facts in fun and informative fashion. Kids will love the stimulating Level 3 text as they decide the answer to this question for themselves.

Discover the coolest robots of today and tomorrow in this colorful, photo-packed book. In this inviting and entertaining format, kids will learn about the science behind these amazing machines. This Level 3 reader is written in an easy-to-grasp style to encourage the scientists of tomorrow! National Geographic supports K-12 educators with ELA Common Core Resources. Visit natgeoed.org/commoncore for more information.