 The interaction of climatic , hydrological , geological and topographical conditions have produced a relatively wide variety of plant and animal species . Bulgaria is one of the countries with highest biodiversity in Europe . Bulgaria 's biodiversity is conserved in three national parks , 11 nature parks and 16 biosphere reserves . Nearly 35 per cent of its land area consists of forests , where some of the oldest trees in the world , such as <unk> 's pine and the Granit oak , grow . Most of the plant and animal life is central European , although representatives of Arctic and alpine species are present at high altitudes . Its flora encompass more than 3 @,@ 800 species of which 170 are endemic and 150 are considered endangered . A checklist of larger fungi of Bulgaria reported that more than 1 @,@ 500 species occur in the country . Animal species include owls , rock partridges , <unk> and brown bears . The Eurasian lynx and the eastern imperial eagle have small , but growing populations . 
