About 5,000 years ago, the center of the United Kingdom was covered with thick forests. Thousands of years ago, these woodlands were cleared by ancient farmers, and today only about 10 percent of the land is forest.
The United Kingdom's complex geology gives rise to a wide variety of landscapes and a range of habitats for its animal and plant life. But it is a very crowded country, and there are not many truly wild places left. The most successful wildlife species are those that can live alongside people.
Great Britain's rugged mountains, like the Scottish Highlands, offer habitat that is relatively untouched by humans. The country's 7,700 miles (12,429 kilometers) of shoreline, ranging from tall cliffs to beaches to marshes, also provide homes for wildlife such as seabirds and seals.