A tiny, green sprout pushes through a snowdrift, the first sign of spring, and Mama Caribou knows it's time to migrate. Baby Bou has other ideas--he wants to stay and play with his friends! Walking north for the summer is booooring, but without his herd, Baby Bou isn't safe from predators. Will Mama Caribou get her son to safety, or will Baby Bou miss out on the big surprise waiting for him at the summer range?