England, like most of the island of Great Britain, was heavily forested, chiefly with oak and beech in the lowlands and pine and birch in the mountainous areas. Woodlands now constitute about 8 percent of the total land area. Various types of fruit trees are cultivated, including the cherry, apple, and plum. A common shrub is a species of furze known locally as gorse. Numerous varieties of wildflowers are also found. An estimated 30,000 animal species live in Britain, although many have limited distribution and are on the endangered list. Britain has many smaller mammals, and the larger ones tend to be gentle. The only surviving large mammals are red deer, which live in the Scottish Highlands and in Exmoor in southwestern England, and roe deer, found in the woodlands of Scotland and southern England. Semiwild ponies also inhabit Exmoor and the Shetland Islands. At one time wild boars and wolves roamed Britain, but they were hunted to extinction.