(..) that creates the seasons. The advance of the seasons brings constant change. As the sun's influence diminishes in the north, so the deciduous forests of America begin to shut down losing their leaves in preparation for the dark cold months ahead. One season hands over to another. (..)

(..) As they disappear, The inhabitants must migrate, hibernate, or face months of near starvation. The Amur leopard - the rarest cat in the world. Here, in the deciduous forests of eastern Russia the winter makes hunting very difficult. Pray animals are scarce, and there's no concealing vegetation. (..)