Take it from my four-year-old son: our Busy Train Book is "hiwarious"! Each spread has a built-in train track—meandering through a village, a farm, and more—with engaging text about all the exciting sights on the way to the zoo. And the most superfun part: a little train engine whizzes around each path with a simple pullback windup! For even more fun, travel from the seaside to a snowy mountain top to an oil rig and beyond with our Busy Helicopter Book. For ages 3 and up. Sold separately.