Why do leaves fall in autumn? Why the leaves fall in autumn, Why the snow is white and Up on the mountain are the titles of the three short films that make up this new program where we find the famous Horned Quartet composed of the cows Aglaé, Rosine, Clarisse and Marguerite. This time, our four friends are invited by their friend JB the ram to a snack up in the mountains, in company of his "little Jeromes", a flock of young sheep. But their walk in the mountains does not go quite as planned.