S1, E1: Between Poland and Slovakia lies a wilderness virtually unique in Europe: the Tatra Mountains. More than two thousand peaks are higher than 2,500 metres. One of the oldest forests in Europe grows on the mountain slopes. Swiss Pines over 1000 years old alternate with thick spruce forests. This is home to some of the greatest predators of our climes, animals that are long extinct elsewhere: bears, wolves and lynx. Untouched primeval woods full of game and nutritious plants offer ideal living conditions, especially for brown bears. Nowhere else in central Europe so many of them live so close together as here in the Tatra Mountains. But what is it that makes this environment so attractive to them and many other rare species? The first part of the series deals with this question, and shows how close the animal interdependence network is.