The bison is Europe’s largest land mammal, with its build resembling that of cattle. It has a relatively short, rounded head and is covered with brown hair from head to tail. The forequarters are bulkier than the hindquarters and are further accentuated by longer hair. Strong, hollow horns are a permanent feature of both sexes and grow with age. Bison are most active at dusk, and their vision has adapted accordingly. Their best-developed senses are hearing and smell. They can live to around 35 years of age. Bison are a social animal that typically live in herds of 8 to 13 animals, though older males tend to be solitary. They feed mainly on green and woody plant matter, including branches, bark and leaves. They prefer younger forest stands with dense undergrowth. In winter, their staple food sources are brambles, tree bark, shrubs and dry grass, which they dig out from under the snow. The bison’s historical range extended almost throughout Europe. In Slovakia today, approximately 70 individuals of the species live wild on a reservation in the Poloniny National Park.