A wildlife area will be a more valuable habitat if species of plants are grouped, as they would occur naturally. For example, a natural woodland can be simulated by planting a mixture of standards, whips and shrubs to give an idea of structure. Combinations of species should be chosen by reference to what grows naturally in the area. In a mature woodland, the plants grow at different heights to form layers. Many plants and animals are most at home in the dappled shade of the woodland edge.