Have you ever seen a cow climbing a tree? Have you ever heard of a cow looking for a treasure and loving to chat with a crow? No? Then you need to urgently get acquainted with Mama Mu and Voron - the heroes of the Swedish fairy tale. Cow Mamu Mu, who is bored for days on end simply chewing herb and who is interested in everything that happens around and strives to become a participant of the events, will amuse the youngest spectators, their brothers and sisters.