The action of estimating large carnivores populations based on tracks is complementary to non-invasive evaluation and tries to obtain data that shall be used in traps, hair traps and automatic cameras emplacement. It also tries to create a database with routes used by large carnivores, database necessary for the management plans of the Natura 2000 sites and realising information campaigns. Studies include bear diet analyse, studies necessary for evaluating travelling models of individuals in Vrancea. For this action is used the methodology already created in the previous project, methodology completed only on what regards the tracks registration forms.