Brown bears are plantigrade animals, which means that they walk on the soles of their feet and so they can stand upright on their rear legs. They vary greatly in their size, weight and colour of fur. Their behaviour varies according to season. In times of food shortage they hibernate, and in thus reducing activity they lose 40% in weight. Unfortunately, the last autocthonous Pyrenean brown bear, “Camille”, disappeared in 2010. Since then, however, there has been an attempt to repopulate the Pyrenees with brown bears introduced from Slovenia.