Our biggest owl is Eurasian eagle-owl. It always looks for rocks surrounded by forests for nesting. Eurasian eagle-owl is active in the evening and at night. Also, it is possible to hear its specific voice. It flies quietly. It hunts small and medium-sized mammals such as rats, birds and amphibians. It is very timid; therefore, its nesting can be threatened by noisy tourists. Only few numbers of this rare owl reside in the locality of the Sulov Rocks.