The mixed and deciduous forest belt is triangular, widest along the western border and narrower towards the Ural Mountains. The main trees are Oak and Spruce, but many other growths of vegetation such as ash, aspen, birch, hornbeam, maple, and pine reside there. Separating the taiga from the wooded steppe is a narrow belt of birch and aspen woodland located east of the Urals as far as the Altay Mountains. Much of the forested zone has been cleared for agriculture, especially in European Russia. Wildlife is more scarce as a result of this, but the roe deer, wolf, fox, and squirrel are very common.