Bratislava, Kopáč Island (Slovakia), the area with the largest known population of B. unicornis in Europe before its conversion by inappropriate conservation management (removal of small trees and shrubs and introduction of intensive sheep grazing) A view of the site in 1950 B view of the site in 2014 with the area of the highest density of B. unicornis outlined with yellow borders C detail of the area with the highest density of the species with faunistic squares marked (see Materials and methods and Fig. 9).