Taking into account the adverse changes in forest habitats resulting from intensive and illegal forest exploitation in the past as well as changes in forest structures over recent years, the disappearance of animal and bird species which require larger undisturbed forest complexes is very likely to occur in the near future. For instance, there is much concern about the potential for maintaining the viable lynx population, the size of which still remains small (only 26 individuals in 2009). Some initial studies have been conducted on migrations of several bird species and sea turtles. Such a methodological gap could be an obstacle for the proper design of the desired ultimate spatial shape of the national ecological network constituted by interrelated, mutually complementary protected areas of different legal protective status, functions and management categories.