A story of two cute chestnut creatures: Pękatek and Tutek who live somewhere in a park under an old chestnut tree. The chestnut brothers reveal some secrets of nature and animals. They are friends with a squirrel, a frog, and an earthworm along with other creatures living in the forest. They are involved in many hilarious adventures. Thanks to the two main characters, children have a chance to get to know the seasons of the year, they learn how animals prepare for winter and how they should take care of animals.