The most common trees are oak, beech, pines, and firs. Serbia is a country of rich ecosystem and species diversity—covering only 1.9% of the whole European territory, Serbia is home to 39% of European vascular flora, 51% of European fish fauna, 40% of European reptiles and amphibian fauna, 74% of European bird fauna, and 67% European mammal fauna. Its abundance of mountains and rivers make it an ideal environment for a variety of animals, many of which are protected including wolves, lynx, bears, foxes, and stags. There are 17 snake species living all over the country, 8 of them are venomous.