72 % of Finland is forested. Except in the extreme south, where aspen, alder, maple, and elm trees are found, the forests are chiefly coniferous, controlled by spruce and pine trees. Finland has nearly 1,200 species of plants and ferns and some 1,000 varieties of lichens. Wildlife includes bear, wolf, lynx, and arctic fox, all found mainly in the less populated northern regions. Reindeer, domesticated by the Saami, are becoming extinct in the wild. Wild goose, swan, ptarmigan, snow bunting, and golden plover nest throughout northern Finland. Freshwater fish include perch, salmon, trout, and pike. The leading saltwater fish are cod, herring, and haddock. Seals are found along the coast.