Funny stories from the life of a boy who lived in the Ice Age. Summer is over, a new school year has begun, and the children of the Sad Bear tribe will have practical lessons. The Neanderthal boy and his friends go on a long hike under the leadership of their teacher Grandfather Puzan to check how much they have learned last year's theoretical lessons. The children have to go through many dangerous and funny adventures - meeting with mammoths, bears, cave lions, wolves, saber-toothed tigers and the most the main thing is a long-haired rhinoceros before they return to their native camp.