Welcome to Grand Canyon! Parent and child abert’s squirrels tour Grand Canyon in best-selling author-illustrator Martha Day Zschock's Hello! board book series for children. In Hello, Grand Canyon! join the pair as they hike, hunt for fossils, and become junior rangers at the national park. Along the way, ride a mule to the bottom of the canyon, raft in the Colorado River, and learn about Native American history. For ages 2-5.