The mountainous topography produces a zonation of flora and fauna. The dry lowlands are occupied by a bush-shrub association known as maquis, in which hairy, leathery leaves reduce transpiration to a minimum. There are some woods in the low-lying regions, but larger forests of oak, beech, and other deciduous species begin at 910 m (2,986 ft). Black pines and other conifers are found at higher elevations in the northern part of the country. There are few wild animals, even in the mountains, but wild birds still abound in the lowland forests.