 There are old growth forests of Macedonian pine ("Pinus peuce"), Scots pine ("Pinus sylvestris"), Norway spruce ("Picea abies") and European silver fir ("Abies alba"), as well as isolated groups of Bosnian pine ("Pinus heldreichii").The most typical mammals in Yulen are brown bear, gray wolf and chamois.Birds are of species conservation importance and include spotted nutcracker, jack snipe, western capercaillie, rock partridge, horned lark, golden eagle, northern goshawk, etc.