As of 2002, there were at least 83 species of mammals, 230 breeding and wintering bird species, and over 3,000 species of plants. According to a 2006 report issued by the International Union for Conservation of Nature and Natural Resources (IUCN), threatened species included 5 types of mammals, 8 species of birds, 7 species of fish, 22 types of mollusks, 22 other invertebrates, and 3 species of plants. Endangered species include Freya’s damselfly, the dusky large blue butterfly, slender-billed curlew, bald ibis, Danube salmon, and the European mink. About 33% of the total land area is protected, including 19 Ramsar wetland sites.